Yes
The sim card.
You can put any SIM card in an unlocked cell phone.
yes
If the phone is unlocked you should be able to put any type of sim card in there as long as it is a GSM phone with a sim card slot.
any AT&T phone that can take that sort of sim card.
There is really no answer u don't a sim card.
Well, the sim card works just like any other sim card in a CINGULAR phone, but if you have the unlock codes to your other phone, I'm sure it will work.
A TF card is a memory card and is not the same as a SIM card.
you have to put a sim card in every phone, if u e=want to save stuff
There is no where to put a sim card in an env touch. Only a micro sd card.
sims card error means your sim card is put in your phone wrong.
I had to unlock my phone and what you do is ring up your current provider and they will give you a code to put in to your phone which will unlock it from the provider and then you can use any sim card from any provider in the phone.