Can i take my sim card from my blackberry and put it in an iphone?

Question

i already have an unlimited data plan and im trying to avoid paying the 50 additional dollars.

Answer 1

Nope, not possible. Its becuase the orginal sim card is linked to the phone. The only way to get around it is to unlock it, which is not impossible to do.  

Answer 2

In our area I think it would work, I think it will work anywhere if both phones use the same type sim.

Answer 3

when me and my dad switch phones sometimes [ he has a razr & i have a small samsung ] we switch SIM cards so i have my data on his phone when im using it.  Do you have AT&T? Or else it wont work.