UK Telecommunications · Guidance & Analysis
The vocabulary of the sector, rendered into English. Every term a contract page or support conversation is likely to produce.
| Term | Rendering |
|---|---|
| 4G Calling / VoLTE | Voice conveyed across the 4G layer; indispensable since 3G's retirement; found within call settings. |
| 5G standalone / 5G+ | 5G upon its own modern core rather than leaning on 4G. Superior responsiveness where deployed; the smallest footprint. |
| Deadlock letter | The network's written concession that it cannot resolve a complaint — early admission to the free ombudsman. |
| eSIM | The SIM as a download rather than plastic. |
| Fair-use policy | The clause qualifying "unlimited" — abroad, upon hotspots, upon "endless" application data. |
| Host network | The physical operator whose masts a virtual brand leases. |
| MVNO / virtual operator | A brand upon leased masts — Tesco Mobile upon O2; SMARTY upon Three. |
| Not-spot | A location no usable signal reaches — the object of satellite messaging trials. |
| OTP | A one-time passcode. Disclosed to no caller, under any account, ever. |
| PAC | The code transferring one's number to a new network. Free: text PAC to 65075. |
| Spend cap | A self-imposed billing ceiling — free upon every network and chronically neglected. |
| STAC | The code closing a line without retaining the number. Free: text STAC to 75075. |
| Text-to-Switch | The Ofcom system underlying the one-text departure. |
| Wi-Fi Calling | Calls across broadband where masts cannot reach — the no-cost remedy for indoor dead spots. |
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