hi
im new at this, but i recently bought an unlocked pearl (8100) and the original gsm carrier was T-mobile, and i also bought a 4gb microsd , and in another posts i read that i need to upgrade my blackberry to certain firmware so it can acept it, but my question is the following : if i upgrade my pearl , do i have to unlock it again?
i mean do i loose the unlocking?

I will apreciate any assistance you can give me.

Greetings.

No, you can't lock your device again, even if you wanted to.

i wonder if there can ever be a reason why you should lock it again