If I unlock my T-Mobile blackberry curve 9300 will it no longer work on T-Mobile?

[Howard]

I am traveling to Italy and want to replace my T-Mobile SIM with a local SIM. I have a prepay arrangement with T-Mobile in the US.

[Unregistered]

I am traveling to Italy and want to replace my T-Mobile SIM with a local SIM. I have a prepay arrangement with T-Mobile in the US.

After Unlocking your Blackberry Curve 9300 you can use any service provider's sim (i:e T-Mobile also)....I have also unlocked my phone from AT&T for the purpose of travelling but now im using the same sim in my country....
I unlocked my phone using UnBBlock.com