Here’s how to activate a T-Mobile SIM card. There are two basic ways to activate your T-Mobile SIM card. Both involve logging into or creating a T-Mobile account, so ensure you have your login ...

You'll then be switched, usually within one working day. You won't need to contact your old provider again. How to activate your new Sim card It's relatively easy to do, usually it's just a case of ...

Youll need a number transfer PIN for this You may find it easier to activate your T-Mobile SIM card on your computer as you'll skip the call to customer service by following these steps ...