This is because your Samsung Galaxy S3 is locked with AT&T network.I suggest you can approach Prounlocking.com and get the unlock code to permanently unlock the phone.Once unlocked you can switch to T-Mobile network.
Method 1:
1 - Switch ON your Samsung SGH-A887 Solstice with a NOT ACCEPTED SIM Card.
2 - Samsung SGH-A887 Solstice will ask for "Password".
3 - Enter the Unlock Code.
OR (if the Samsung SGH-A887 Solstice shows "Insert Correct SIM Card")
Method 2:
1 - Switch ON your Samsung SGH-A887 Solstice with a NOT ACCEPTED SIM Card.
2 - Don't bother about what's being displayed on your Samsung SGH-A887 Solstice .
3 - Compose : #0111*CODE#.
NOT ACCEPTED: We mean, to use a sim card from a network other than the network your Samsung SGH-A887 Solstice is locked to.
CODE: Its the unique Unlock Code for your Samsung SGH-A887 Solstice .
If method 2 does not work, you can try method 2 again but this time without any SIM card on your Samsung SGH-A887 Solstice .
Each Samsung SGH-A887 Solstice mobile phone has an unique unlock code. You can buy the unique unlock code for your Samsung SGH-A887 Solstice mobile phone using the form above.
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