Your phone must also be unlocked before activating ... customer service instead of self-serve online tools. There's more than one way to activate a SIM card on Metro by T-Mobile Whether you ...

When completing the activation process online, you can use any phone ... A simple way to check if your device is unlocked is ...

(Subscriber Identity Module lock) A function in GSM cellphones that restricts the phone's use to a particular cellular carrier identified by a SIM card ... the phone may be unlocked by entering ...