AT&T SIM card to T-mobile android?

[Vintage]

I trying to put an AT&T cars in a T-mobile phone but it won't import my contacts , and it won't ring when someone calls. How can i crack it?

 

[tasteyy]

I trying to put an AT&T cars in a T-mobile phone but it won't import my contacts , and it won't ring when someone calls. How can i crack it?

You need to Unlock your Mobile Phone from T-Mobile network to use the AT&T Sim card in it..Without Unlocking you cannot use other GSM Network Sim card.To Unlock it specify mobile phone brand and model.Unlock it easily using the unlock code from the site Onlinegsmunlock.com
Then you can save Contacts in Phone Book Memory so after Unlock it you can call to any one.If you need Contact means you can delete it.