Step 1:Contact your service provider first to make sure you can activate a used cell phone through them. Some companies don't do this, so it's important that you get in touch with them. Step 2:Give the provider the used phone's Electronic Serial Number (ESN) to see if it is compatible with the provider's service. You can locate the ESN number by removing the battery. The number is on the phone underneath the battery, usually an 11 digit number. If the phone has a different service provider's name and logo on it, it is a locked phone and cannot be used with any other provider other than the one on the phone. Step 3:Try switching out the SIM card once you have the okay from your service provider. A SIM card is a small circut board within your cell phone that has all your personal information on it and is linked with your service provider. Put the card from your old phone into your newly acquired phone. If that works, you're set. If not, move on to the next step. Step 4:Call your cell phone company on a land line or different cell phone. Tell them you would like to activate a new phone and start an account or to replace your old phone. They will ask you some security questions and for the make, model, serial number and ESN, so have these handy. They will tell you what to do from there and walk you through it. If you have :1) lost your phone, OR2) Your current SIM card has somehow gotten damaged, OR3) You simply want to add another line to your account,then this brand-new unactivated SIM card is the answer.Most of all it's always a good idea to have a back up SIM card.
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Can I Activate A Lost Phone (T-Mobile)?
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