BT Business Terms and Conditions
On this page you’ll find links to the terms for some of our business products and services. To make them easier to find we’ve grouped them together under headings such as Lines, Broadband and Mobile.
You can view a summary of any new terms, or material changes to your terms that will come into effect shortly under the “Changes to terms” heading below. The most recent entries are set out at the top of the list.
Please note that supplementary terms are set out in the BT Price List and they may form part of the contract for the relevant product or service.
Any amendments to the BT Price List will be published in the BT Price List.
Further related information can be found on BT Global Services Terms and Conditions page.
Notification to Ofcom
You can also view any new or amended terms for regulated products and services that have been notified to Ofcom.
Material changes to your contract will be set out below:
Changes to our terms following implementation of GDPR PDF 109KB
These General Terms apply to your contract unless we:
say otherwise in the entry for your service on this website or in your other contract documents; or
we provide you with a different set of standard terms.
General Terms PDF 366KB
Terms of Use for My BT Business Account PDF 484KB
Service Schedule for My BT Business Account – BT Business Apps PDF 322KB
BT Business Apps – End User Licence Agreement PDF 295KB
Service Schedule for BT Device Protection by Symantec PDF 315KB
Microsoft Office 365 and Microsoft Office Cloud Services offered by BT (on or after 5 March 2018) PDF 322KB
If you can't find your terms listed here, please refer to the Legacy dropdown below.
Conditions for BT Business Services PDF 313KB
BT Billing Analyst PDF 102KB
BT Billing Gateway Service PDF 99KB
BT Business Paper-Free Billing PDF 48KB
Conditions for BT OneBill Online PDF 103KB
Terms of use for My BT Business Account PDF 484KB
Service Schedule for My BT Business Account - My Bill and Analytics PDF 277KB
If you can't find your terms listed here, please refer to the Legacy dropdown below.
BT Business Broadband
The contract for customers ordering BT Business Broadband products on or after 15th September 2014 is made up of:
the General Terms – which you can find under the General Terms sub menu above;
the BT Business Broadband Schedule to the General Terms – which you can find below;
Value Added Services Annex to the BT Business Broadband Schedule – which you can find below and is dependent on whether you ordered a Service before or after 10 April 2017;
any Order; and
the BT Price List.
BT Business Broadband, Superfast and Ultrafast Schedule to the General Terms (from 4 February 2019) PDF 414KB
BT Business Broadband Schedule to the General Terms (if ordered before 4 February 2019) PDF 379KB
Value Added Services Annex for BT Business Broadband, Superfast and Ultrafast Schedule PDF 309KB
Value Added Services Annex to the BT Business Broadband Schedule (if ordered between 10 April and 3 February 2019) PDF 288KB
Value Added Services Annex to the BT Business Broadband Schedule (before 10 April 2017) PDF 300KB
Please note that the Charges Schedule is no longer used. All information previously contained in the Charges Schedule is now at Section 52, Part 6 of the BT Price List. The Customer Service Compensation Scheme is contained at Part C of the BT Business Broadband Schedule
BT Bundles
The bundle terms below apply if you have ordered a bundled service that consists of any of the following - BT Business Broadband, BT Business Call Essentials and BT Business Services (Telephone Service - PSTN).
Bundle Terms PDF 272KB
BT Business Total Broadband products
BT Business Total Broadband products are not available for new supply from 15 September 2014. The following terms and conditions apply to BT Business Total Broadband products (“legacy broadband products”) (as set out in the terms and conditions) ordered on or before 14 September 2014.
Conditions for BT Business Services PDF 243KB
Service Schedule for BT Business Broadband Access Service PDF 253KB
Charges Schedule for BT Business Broadband Access Service PDF 200KB - Please note that the Charges Schedule is no longer used. All information contained in the Charges Schedule is now at Section 52, Part 6 of the BT Price List
Charges Schedule for Legacy BT Business Broadband Access Services PDF 394KB - BT Business Broadband Access Service also apply - Please note that the Charges Schedule is no longer used. All information contained in the Charges Schedule is now at Section 52, Part 6 of the BT Price List
Customer Service Compensation Scheme PDF 269KB - This Scheme and terms apply only to customers who ordered the legacy products on or after 30 October 2010.
Traffic management PDF 316KB
Mobile Broadband
Conditions for BT Business Services PDF 174KB
Service Schedule for BT Business Mobile Service PDF 371KB
Annex to the Service Schedule for BT Business Mobile Service PDF 214KB
BTnet Leased Line
Service Schedule for BTnet (also marketed as Internet Connect UK) PDF 423KB
Annex to the Service Schedule for BTnet (also marketed as Internet Connect UK) - BTnet Security PDF 305KB
Annex to the Service Schedule for BTNet (also marketed as Internet Connect UK) - BT Assure DoS PDF 0.99MB
BT Business Email
Business Email Lite powered by Microsoft® Office 365 PDF 182KB
BT Business Lite Web Hosting and Business Email Lite powered by Microsoft® Office 365 PDF 1.25MB
Service Schedule for BT Office Anywhere PDF 367KB
Microsoft Office 365 offered by BT – Annex to Service Schedule – Service Level Agreement PDF 131KB
Voice services
0800/0844 number rental is subject to BT Inbound Contact UK Conditions
Contract for BT Business Service (BT IP Trunk) - Main Conditions PDF 114KB
Your terms for our Calls and Lines Services
These services are: PSTN, ISDN, Featureline, Featureline Compact, Featureline Corporate and Embark.
The services allow you to make and receive calls. Featureline, Featureline Compact, Featureline Corporate and Embark provide additional functionality including call-handling features and network features. The following documents make up your contract for these services:
- the BT Business Services – Telephone Service – Phone Calls and Lines (PSTN, ISDN, Featureline, Featureline Compact, Embark and Featureline Corporate) Schedule to the General Terms – which you can find below;
- any Order;
- the BT Price List; and
- the General Terms, unless we:
say otherwise in your other contract documents; or
we provide you with a different set of standard terms.
You can find the Customer Compensation Scheme in Part C of the schedule and this sets out the Service Care Levels that apply to the different Calls and Lines services.
You may be able to include your Calls and Lines services in a Calls and Lines Package – please see the Calls and Lines Packages entry for more information.
BT Call Tracker PDF 243KB
If you can't find your terms listed here, please refer to the Legacy dropdown below.
Your terms for our Calls and/or Lines Packages
These packages allow customers to consolidate spend on specified services including Calls and Lines services.
Benefits may include capped or discounted calls.
To obtain the benefits the customer may have to commit to a level of spend and a Minimum Period of Service. Details for each Calls and Lines Package including:
- which services can be included;
- the benefits; and
- the commitments that apply,
are set out in the relevant Annex and Section 56 of the BT Price List.
The following documents make up your contract for the Calls and Lines Packages:
- the Calls and Lines Packages Schedule to the General Terms – which you can find below;
- the Annex to the Calls and Lines Packages Schedule for the specific Calls and Lines Package – which you can find below;
- any Order;
- the BT Price List; and
- the General Terms, unless we:
say otherwise in your other contract documents; or
we provide you with a different set of standard terms.
The services included within the Calls and Lines Package are provided under the separate contracts that apply to those services.
Calls and Lines Packages Schedule to the General Terms PDF 291KB
BT Accumulate PDF 276KB
BT Business Call Essentials PDF 272KB
BT Business Complete PDF 276KB
BT Business Flex PDF 272KB
BT Business One Plan PDF 282KB
BT Business Plan (Customer Based and Lite) PDF 279KB
BT Customer Commitment PDF 272KB
BT Premier Value PDF 275KB
If you can't find your terms listed here, please refer to the Legacy dropdown below.
Conditions for BT Business Services PDF 112KB
Service Schedule for Starter and Professional Packs PDF 163KB
Service Schedule for EasyStoreMaker PDF 100KB
Domain Name Terms & Conditions PDF 476KB
Web Hosting & PC Security Bundle Terms & Conditions PDF 65KB
Web Hosting with BT PC Security & PC Back Up Bundles Terms & Conditions PDF 67KB
Service schedule for Internet Services Bundles PDF 88KB
Service Schedule for BT eShop Service PDF 83KB
BT Business Lite Web Hosting and Business Email Lite powered by Microsoft® Office 365 PDF 1.25MB
Marketing solutions
Service Schedule for BT Web Starter PDF 381KB
Service Schedule for BT Web Manager PDF 285KB
Service Schedule for BT Web Expert PDF 285KB
Service Schedule for BT Search Marketing PDF 169KB
Service Schedule for BT Website Manager PDF 175KB
The Advertising Policy PDF 1,091KB
If you can't find your terms listed here, please refer to the Legacy dropdown below.
Your terms for IP Comms.
These services allow customers to make and receive calls over the internet.
BT Cloud Phone
The following documents make up your contract for BT Cloud Phone Service:
- the General Terms;
- BT Cloud Phone Schedule to the General Terms;
- the RingCentral Development Platform Annex;
- any Order; and
- the BT Price List.
BT Cloud Phone Schedule PDF 391KB
RingCentral Development Platform Annex PDF 286KB
BT Cloud Voice and Cloud Voice SIP-T
The following documents make up your contract for BT Cloud Voice and Cloud Voice SIP-T:
- the General Terms;
- BT Cloud Voice and Cloud Voice SIP-T Schedule to the General Terms;
- BT Applications Software Licence Agreement.
BT Cloud Voice and Cloud Voice SIP-T Schedule to the General Terms PDF 384KB
BT Cloud Voice desktop application PDF 124KB
BT Cloud Voice mobile application PDF 124KB - these terms apply to any customer who has purchased MiCloud Service. You can find a copy of your General Terms in Large Business and Public Sector
MiCloud and MiCloud Advance PDF 340KB - These terms apply to any customer who has purchased the MiCloud and MiCloud Advance Service. You can find a copy of your General Terms under the Large Business and Public Sector tab on the Terms of Agreement page.
For IT Services, these General Terms will apply PDF 390KB
Purchased Equipment Schedule PDF 667KB
IT Services Annex to the Purchased Equipment Schedule PDF 770KB
Business Review Consulting Schedule PDF 269KB
Collaboration Adoption Service Schedule PDF 347KB
Design and Implementation Schedule PDF 374KB
Hardware Support Schedule PDF 843KB
iNcare Schedule PDF 873KB
iNlife Managed Security Schedule PDF 1042KB
Network Assessment Service Schedule PDF 307KB
Project Management PDF 323KB
Service Delivery Management Schedule PDF 365KB
Transition to Cloud PDF 303KB
End-User Licence Agreements and Additional Terms:
If you can't find your terms listed here, please refer to the Legacy dropdown below.
Conditions for BT Business Services PDF 328KB
BT PC Back Up/Security
Security and BT PC Back Up PDF 320KB
Enhanced Care
Service Schedule for BT Business Enhanced IT Support Subscription Service PDF 233KB
Service Schedule for BT Business Enhanced IT Support Server Subscription Service PDF 216KB
ICT Partner Solutions
Conditions for ICT Partner Solutions PDF 219KB
Service Schedule for SAS Support Services PDF 305KB
Service Schedule for Phoenix Co-Lo Services PDF 245KB
Service Schedule for Phoenix Business Continuity Services PDF 233KB
Service Schedule for IPscape Services PDF 44KB
Annex 1 to Service Schedule for IPscape Services PDF 93KB
Service Schedule for SecureData Service PDF 384KB
Service Schedule for SecureData Websense Services PDF 40KB
Service Schedule for Applicable Hosting Services PDF 116KB
Service Schedule for Waveworks Services PDF 246KB
Service Schedule for SAS 21CN Migration Service PDF 57KB
Service Schedule for BT Cloud Unified Communications PDF 339KB
BT Managed WAN PDF 915KB
BT Secure Contact PDF 292KB
Expert Setup
BT Expert Setup Schedule to the General Terms PDF 527KB
Intelligent Assets
Intelligent Assets PDF 368KB
BT Billing Analyst Elite PDF 98KB
BT Business Broadband Voice (VoIP) PDF 112KB
BT Business eSaver – Broadband, Calls and Lines PDF 306KB
BT Business Hosted VoIP (Enhanced Service) PDF 45KB
BT Business Reward PDF 257KB
BT Cloud Voice and Cloud Voice SIP-T - these terms and conditions apply to BT Cloud Voice Service (as set out in the terms and conditions) ordered on or before 13 August 2017 - PDF 384KB
BT OneBill Online PDF 48KB
BT SIP Trunk - these terms and conditions apply to BT SIP Trunk Service (as set out in the terms and conditions) ordered on or before 13 August 2017 - PDF 163KB
Online Starter PDF 40KB
BT Business Broadband Advanced Service
Conditions for BT Business Broadband Advanced Service PDF 52KB
Service Schedule for BT Business Broadband Advanced Service PDF 37KB
Service Guarantee for BT Business Broadband Advanced Service PDF 21KB
BT Office Anywhere
Service Schedule for BT Office Anywhere PDF 367KB
Microsoft Office 365 offered by BT – Annex to Service Schedule – Service Level Agreement PDF 132KB
BT One Phone Connect
Service schedule for BT One Phone Connect PDF 333KB
Annex to the Service Schedule for BT One Phone Connect – BT One Phone Coverage Solutions PDF 78KB
Annex to the Service Schedule for BT One Phone Connect – Private Voice Extra & Private Data Extra PDF 84KB
Domains and Web Hosting
Online Starter Kit for Office 365 (On or After 13th July 2015) PDF 340KB
Web Consult & Build Service Schedule PDF 61KB
Service Schedule for Starter and Professional Packs PDF 163KB
BT WebWorld PDF 99KB
IT Support Manager
BT Business IT Site Manager Subscription Service PDF 319KB
BT Business IT Support Manager pay per use on-site Service PDF 142KB
BT Business IT Support Manager PC Incident Service PDF 137KB
BT Business IT Support Manager PC Subscription Service PDF 144KB
BT Business IT Support Manager Server per incident Service PDF 121KB
BT Business IT Support Manager Server Subscription Service PDF 127KB
BT Business IT Manager On-Site Repair Subscription Service PDF 178KB
Microsoft Office 365 Small Business and Microsoft Office 365 Small Business Premium offered by BT (before 5 March 2018) -
Conditions for BT Business Services PDF 194KB
Charges Schedule for Microsoft Office 365 Small Business offered by BT and Microsoft® Office 365 Small Business Premium offered by BT PDF 179KB - Applicable to new customers entering into contracts on or after 10th October 2011
Charges Schedule for Microsoft Office 365 Small Business offered by BT PDF 144KB - Applicable to customers whose BT email service was upgraded and moved to a Microsoft platform during the period 10th October 2011 through to mid-2013
Mobile Service - Standard Tariffs - applies prior to 15.11.10
Mobile Service Main Conditions PDF 206KB
BT Talk Time Terms and Conditions PDF 85KB
Business Circle Complete Terms and Conditions PDF 73KB
Blackberry Internet Service (with or without Satellite Navigation) Terms and Conditions PDF 84KB
BT Business Mobile Broadband Terms and Conditions PDF 86KB
Mobile Service (Business) - Pre 19th May 2014
Service Schedule for BT Business Mobile Service PDF 371KB
Annex to the Service Schedule for BT Business Mobile Service PDF 214KB
Mobile Service (Business) - On or after 19th May 2014
Service Schedule for BT Business Mobile Service PDF 474KB
Annex to the Service Schedule for BT Business Mobile Service PDF 231KB
Mobile Service - Selector (Business)
Conditions for Business Mobile Services PDF 304KB
Service Schedule for BT Autobalance PDF 85KB
Service Schedule for BT Datazone PDF 25KB
Service Schedule for BT Business Mobile Broadband PDF 98KB
Other
Analogue Presented MAC Vision Circuits PDF 36KB
Analogue Presented PAL Vision Circuits PDF 36KB
BT Broadlook Vision Circuits PDF 37KB
BT Chargecard Service PDF 169KB
BT DQC118xxx Service PDF 60KB
BTnet VPN Star PDF 36KB
Cardway 2000 Service Conditions PDF 32KB
Cardway 2000 Service Schedule PDF 22KB
If you can't find your terms listed here, please refer to the Legacy dropdown above.
Please note that BT Mobile and EE Mobile are provided under separate terms. If you’ve bought a service from BT under the BT Mobile Schedule to the General Terms or a Service from BT under the EE Mobile Schedule to the General Terms, the relevant terms can be below.
BT Mobile
Your terms for BT Business Mobile Service
The following documents make up your contract for BT Business Mobile Service:
- the schedule and annexes that you can find below:
- BT Business Mobile Schedule to the General Terms;
- BlackBerry Annex to the BT Business Mobile Schedule - this applies if you have ordered BlackBerry Enterprise Server, BlackBerry Enterprise Service 12, BlackBerry Internet Service and BlackBerry Enterprise Server Express;
- On Site Transmission Equipment Annex to the BT Business Mobile Schedule - this applies if you have ordered any On Site Transmission Equipment;
- MobileIron Services Annex to the BT Business Mobile Schedule - this applies if you have ordered any MobileIron On-Premises Services or MobileIron Cloud Services:
- any Statement of Requirements where you have ordered On Site Transmission Equipment;
- any Charges Schedule;
- any Order;
- the BT Price List
- The General Terms which you can find:
- If you have received a Charges Schedule at: General Terms on Global Services
- If you have not received a Charges Schedule at: General Terms dropdown above
Main Conditions – Conditions for BT Business Services PDF 174KB
BT One Phone SME
BT One Phone SME Schedule to the General Terms PDF 447KB
SIP Networks Annex to the BT One Phone SME Schedule PDF 291KB
Convergence Services Annex to the BT One Phone SME Schedule PDF 289KB
BlackBerry Annex to the BT One Phone SME Schedule PDF 300KB
MobileIron Cloud Service Annex to the BT One Phone SME Schedule PDF 310KB
One Phone Portal Annex to the BT One Phone SME Schedule PDF 291KB
Onsite Mobile Networks Annex to the BT One Phone SME Schedule PDF 280KB
Private Voice and Data Extra Annex to the BT One Phone SME Schedule PDF 289KB
Signal Assist Annex to the BT One Phone SME Schedule PDF 268KB
Recording Extra Annex to the BT One Phone SME Schedule PDF 274KB
BT One Phone (this may be referred to as BT One Phone Corporate)
BT One Phone Schedule to the General Terms PDF 454KB
SIP Networks Annex to the BT One Phone Schedule PDF 299KB
Convergence Services Annex to the BT One Phone Schedule PDF 298KB
BlackBerry Annex to the BT One Phone Schedule PDF 311KB
MobileIron Cloud Service Annex to the BT One Phone Schedule PDF 327KB
One Phone Portal Annex to the BT One Phone Schedule PDF 299KB
Onsite Mobile Networks Annex to the BT One Phone Schedule PDF 284KB
Private Voice and Data Extra Annex to the BT One Phone Schedule PDF 299KB
Signal Assist Annex to the BT One Phone Schedule PDF 272KB
Recording Extra Annex to the BT One Phone Schedule PDF 281KB
BT One Phone Office and Professional
Service Schedule for BT One Phone PDF 436KB
Service Schedule for BT One Phone – on or after 1 December 2017 PDF 436KB
Annex to the Service Schedule for BT One Phone – BlackBerry PDF 331KB
Annex to the Service Schedule for BT One Phone – MobileIron Cloud Service PDF 331KB
Annex to the Service Schedule for BT One Phone – for the BT One Phone Portal PDF 289KB
Annex to the Service Schedule for BT One Phone – BT Signal Assist PDF 278KB
Annex to the Service Schedule for BT One Phone – Recording Extra PDF 210KB
Annex to the Service Schedule for BT One Phone – Onsite Mobile Network PDF 305KB
Annex to the Service Schedule for BT One Phone – Onsite SIP Network PDF 305KB
Annex to the Service Schedule for BT One Phone – Private Voice Extra and Private Data Extra] PDF 395KB
BT One Phone - Flexible Caller Line Identity (CLI) Extra – Order Form PDF 290KB
Mobile Service (Business) - On or after 1st August 2016
BT Business Mobile Schedule to the General Terms PDF 363KB
BlackBerry Specific: Annex to the BT Business Mobile Schedule PDF 275KB
On Site Transmission Equipment: Annex to the BT Business Mobile Schedule PDF 314KB
MobileIron Services Specific Terms and Conditions: Annex to the BT Business Mobile Schedule PDF 315KB
BT Field Force Automation Services
BT Field Force Automation Purchased Equipment and Software Schedule PDF 358KB
BT Field Force Automation Support Services Annex PDF 323KB
Other
Conditions of Sale - Mobile Devices PDF 283KB
Conditions of Supply (where Customer applies to a third party finance house or other third party for financial facilities) – Mobile Devices PDF 121KB
Conditions for the Provision of Devices for Customer Evaluation PDF 119KB
Service Schedule for BT Mobile Device, Application, Content and E-Mail Management PDF 268KB
Appendix to the Contract for BT Business Mobile Service PDF 224KB
Appendix to the Contract for BT One Phone Connect PDF 379KB
EE Mobile is made up of:
- General Terms and Conditions (GTs)
- EE Mobile Schedule
- Order Form
In addition the following documents may also apply:
- Solutions Terms
- Solution Description
- Statement of Requirement
- Contract Change Note (CCN)
- EE Price Guide for Large Business
EE Mobile Schedule PDF 413KB
Solution Terms for 4G Public Wifi in Box PDF 391KB
Solution Terms for Additional Network Equipment PDF 655KB
Solution Terms for Connected Vehicle PDF 373KB
Solution Terms for Customised Apps PDF 302KB
Solution Terms for Lone Worker from EE (Peoplesafe) PDF 377KB
Solution Terms for Lone Worker SIM Only Service Plan PDF 272KB
Solution Terms for Mobile Device Management PDF 387KB
Solution Terms for Mobile Voice VPN PDF 375KB
Solution Terms for On-site Support (Employees Transferring) PDF 293KB
Solution Terms for On-site Support (No-Employees Transferring) PDF 284KB
Solution Terms for Rapid Site PDF 281KB
Solution Terms for Service Add-Ons PDF 268KB
Solution Terms for Service Relationship Management PDF 371KB
Solution Terms for Signal Booster PDF 274KB
Solution Terms for Tailored End to End PDF 360KB
Solution Terms for Tailored Set Up PDF 256KB
Solution Terms for Total Resource (Employees Transferring) PDF 390KB
Solution Terms for Total Resource (No Employees Transferring) PDF 381KB
Ofcom General Condition 9.2 Additional Information PDF 348KB
Analogue Pool Contract PDF 124KB
Audio Broadcast Network Services PDF 110KB
Bespoke High Bandwidth Private Service PDF 200KB
BT Inbound Contact UK Conditions
BT Closed Circuit Television Service PDF 5.30MB
BT L–Band Relay Service PDF 111KB
BT MediaNet 2000 PDF 79KB
BT Prime Service PDF 34KB
BT Redcare View PDF 0.98MB
BT Select Services PDF 70KB
BT VoIP Services PDF 95KB
Bureaufax and Telex Bureau Services PDF 26KB
Citysure and Circuitsure PDF 189KB
Conversion Tariff (between ITU-R Recommendation BT.601 (270 Mbit/s) and PAL PDF 34KB
Conversion Tariff (between ITU-R Recommendation BT.601 (270Mbit/s) and SDV) PDF 37KB
Customer Controlled Services PDF 22KB
Digital Video Broadband (DVB) ASI Non-resilient Service PDF 78KB
Digital Video Broadband (DVB) ASI Resilient Service PDF 69KB
Digital Video Storage Service PDF 2.69MB
EPS81, EPS82, EPS83, EPS84 and EPS 98 Services PDF 34KB
Facility Line Circuits (1, 3, 5 year Minimum Term contracts only) PDF 34KB
Facility Line Circuits (10 year) Service PDF 146kb
Featurenet Service PDF 150KB
Maintenance of Equipment Conditions PDF 243KB
Maintenance of Equipment Service Schedule PDF 152KB
Maintenance of Equipment - Customer Service Compensation Scheme – Annex PDF 190KB
MusicLine 2000 Services PDF 34KB
MusicLine One Service PDF 34KB
Netstream Corporate/Enterprise Conditions PDF 348KB
NetStream Corporate/Enterprise Schedule 1 - Opening Contract Details PDF 16KB
NetStream Corporate/Enterprise Schedule 2 - Opening Inventory PDF 15KB
NetStream Corporate/Enterprise Schedule 3 - Record of Contract Changes PDF 67KB
One Cloud iComms PDF 211KB
Private Services PDF 495KB
Sale – BT Conditions of Sale PDF 307KB
Serial Digital Interface (SDI) Access Point PDF 34KB
Serial Digital Interface (SDV) Vision Circuits PDF 34KB
Supply – Financing PDF 147KB
Telephone Service from a BT Payphone PDF 30KB
TimeScale Service PDF 97KB
UK Maintenance Service – Standard Care, Business Care & Business Premium Care PDF 336KB
VoIP Calls Commitment Scheme PDF 33KB