Get the unlocking service from your network provider[] .Once you get the code, you may follow the instructions here,
1 - Switch ON your Motorola A1000 with a NOT ACCEPTED SIM Card.
2 - Click on the icon Phone.
3 - Enter the following keys: ** 057 *.
4 - Motorola A1000 will display "locking enter personalization".
5 - Enter the Unlock Code.
6 - Click OK.
If you have any doubt in this, check the instructions here Mobileunlockguide.com/motorola-a1000 ..
