Glossary of terms
| Term | Definition | 
| A | |
| AMSR | Anonymised Mobile Subscription Reference. This is a unique identifier used by EE that replaces an individual’s mobile phone number and that may be used to distinguish one individual from another. | 
| API | Application Programming Interface | 
| APN | Access Point Network | 
| ATP | Account Takeover Protection | 
| B | |
| BAN | Billing Account Number | 
| C | |
| CRM | Customer Relationship Management | 
| CTN | Customer Telephone Number | 
| D | |
| E | |
| eKYC | Electronic Know Your Customer | 
| eSIM | Embedded SIM | 
| F | |
| G | |
| H | |
| HAC | Header Enrichment Code | 
| HBB | Home Broadband | 
| HLR | Home Location Register | 
| HSS | Home Subscriber Server (or Service) | 
| HTTP | Hyper Text Transfer Protocol | 
| HTTPS | Hyper Text Transfer Protocol Secure | 
| I | |
| IMEI | International Mobile Equipment Identity number | 
| IMSI | International Mobile Subscriber Identifier | 
| J | |
| K | |
| KYC | Know Your Customer | 
| L | |
| M | |
| MCC | Mobile Country Codes | 
| MCN | Mobile Contact Number - provided for use in relation to a user's EEID | 
| MIG | Mobile Internet Gateway | 
| MMS | Multimedia Messaging Service | 
| MNC | Mobile Network Codes | 
| MNO | Mobile Network Operator | 
| MSISDN | Mobile Subscriber Integrated Services Digital Network Number | 
| MVNO | Mobile Virtual Network Operator | 
| O | |
| OTP | One Time Pin - used to verify that a user has access to a mobile number | 
| OUK | Orange UK | 
| P | |
| PAYG | Pay As You Go | 
| PAYM | Pay Monthly | 
| PCR | Pseudonymous Customer Reference. This is a unique identifier that replaces an individual’s mobile phone number and that may be used to distinguish one individual from another. | 
| Q | |
| R | |
| RAN | Radio Access Network | 
| RCS | Rich Communication Services (RCS) is a communication protocol between mobile-telephone carriers and between phone and carrier. | 
| ReST | Representational State Transfer | 
| S | |
| SIM | Subscriber Identification Module | 
| SLR | Service Level Request | 
| SMS | Short Messaging Service | 
| SOA | Service-Oriented Architecture | 
| SOAP | Simple Object Access Protocol | 
| SPG | Secure Partner Gateway | 
| SQL | Structured Query Language | 
| SSO | Single Sign-On | 
| SwA | SOAP with Attachment | 
| T | |
| THBS | Torry Harris Business Systems | 
| TMUK | T-Mobile UK | 
| TPS | Transactions per second | 
| U | |
| UAT | User Acceptance Test | 
| URI | Uniform Resource Identifiers (ReST) | 
| URL | Uniform Resource Locator | 
| V | |
| VPN | Virtual Private Network | 
| W | |
| X | |