How can I unlock my blackberry pearl?

[lorein_003]

I just recently got this phone because my dad didn't want it...

we don't talk, so my sister actually took it from him because he wasn't even using it.

unfortunately I have AT&T...

How can I unlock the T-mobile blackberry pearl?
it says..invalid sim card...

[RICH]

1 - Using the menu go to Settings Menu -> SIM card press select.
2 - While holding the SHIFT key, type MEPD or (MEPPD for Vodafone Handsets)
3 - You should now see the five locking categories listed.

4 - While holding the SHIFT KEY, type MEP2 or (MEPP2 for Vodafone handsets)
5 - Release the shift key.
6 - You are now prompted to enter the Network MEP code (it will also state how many attempts left)
7 - Enter the code
8 - Enter Return/Enter
9 - The device should then be unlocked

[kiran1]

To unlock your mobile phone many methods are there , like codes, software, cables, hardware & calculator.............Among all these methods i prefer you to unlock your mobile with codes, why i am saying codes means to unlock your mobile with codes are simple & easy way, just follow the instructions and get the unlock code from this site Wicked Unlock.com , just give your IMEI number , country & network lock surely you can get the unlock code for your blackberry model mobile from the network lock.............Wish you all the best...........