Dear Nafula, try to reinstall your blackberry software since unlocked blackberry curve 8520 software usually has previous network configuration. But to make sure what exactly your problem you can bring your phone at local mobile repair shop and asking them to check your phone.
You can type any password 10 times at your phone, it can make your blackberry curve 8520 unlocked from old password. But you also lose all your previous data during that process it's kind like to force your blackberry unlocked without using any software. If your phone still can't receiving calls or message try to reflash your blackberry.
Notes:
configure received message settings:
1. From standby mode, press the OK Key [OK] to unlock the keypad,
then press the Left Soft Key [Message], then the Left Soft Key
again for [Settings].
2. Press the Directional Key up or down to highlight one of the
settings below, then press the OK Key [OK] to select it:
ENTRY MODE
Sets an Entry Mode as a default. For example, if Abc Mode is the default, its icon
will appear.
1. Select "Abc", "ABC" or "123" by pressing the Directional Key up or
down then press the OK Key [OK].
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