Starting the line
Use the instructions supplied with the Three SIM. Confirm whether it is a new account, a replacement or an upgrade SIM. These can require different actions; a new card is not proof that the existing number has moved.
Keeping a familiar handset
Check device compatibility for current voice and data services, SIM size and any lock. For dual-SIM hardware, choose the Three line for calls or data deliberately.
Replacing safely
Request a replacement through official Three support or the account. Keep access to verification. If the old SIM is lost or stolen, ask Three to secure the line promptly.
Separate number transfer
A replacement card and a PAC serve different purposes. If bringing a number from another provider, use Three’s official switching route after checking the existing account obligations.
Before you act
Confirm current details directly with the official provider. Our information is independent, general and free of a guidance fee. We do not sell or arrange services.
The official reading list