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Gotten unlock code from t-mobile but need a different carrier sim ...
I requested an unlock code for my HTC One M7. I have T-Mobile. I received the code a day later but it's states I need to insert a foreign sim then it will pop up to enter the code. I didn't know of this since in the past I only had Blackberry and when I unlocked it was done within the settings of the OS.
My question is can I just buy a sim card that's not actually activated from another carrier and try it? Or the sim from the other carrier has to be activated? Most ppl I know either uses tmobile/sprint or metro. So that's why I'm asking if I should just purchase a non activated sim. Anyone with experience with using unlock codes?