SIM cards provided by MVNOs that use the Three network will only taiwan phone number library work with 3G, 4G and 5G devices, as Three does not use the UK's 2G infrastructure.
This table contains data on cellular companies and their main services:
Distribution of the mobile market in the UK
Package options for England
In addition to physical mobile operators, there are also virtual ones that use the infrastructure of a physical operator under their own name and with their own tariffs. Such operators include Lebara, Lycamobile and Giffgaff.
Cellular communications are divided into long-term contract and “as you go” (Pay as you go) tariffs. Tourists do not need contract tariffs, so in the future we will only talk about Pay-as-you-go tariffs or “30 days” tariffs, that is, “contracts” valid for only 30 days.
To buy such SIM cards in the UK, no documents are required. Before buying a card, find out the size or type of SIM card in your device. It can be standard, micro or nano size. If you do not understand this, then the store will always help you make the right choice.
Cellular connection for voice calls from England
If you don't need mobile internet in London, and you only need a SIM card for voice calls abroad from England (for example, to Russia or Ukraine) or within England, then buy a Lebara Mobile card and don't worry.
The card is often free, provided you buy £5 worth of credit, although I have seen cases where dodgy shopkeepers wanted between a pound and a fiver for the card itself. You can safely ignore them, unless you have time to find another shop. There have been cases of people buying a Lebar SIM card online for a hotel address.
SIM cards with mobile Internet in London are offered by almost all mobile operators.
Cellular communications – operator Three. The operator Three (3, Tri) is very popular – they initially positioned themselves as a mobile Internet operator, and they have a range of tariffs from which you can choose the most suitable one. In addition to SIM cards, you can also buy a USB dongle for your computer or a mobile WiFi hotspot (MiFi) from them if you are traveling with a group.
Mobile Internet from Three
Mobile – Libara. Libara is worth mentioning – they also have mobile data plans, like £10 for 1GB of data. It lasts for one month and you use the same card as for voice calls.
