Will my SIM card work for an iPhone?

Question

I have a smaller AT&T phone from a while ago. I want to take out the SIM card and put it into my iPhone 6. Will this work?
*Best answers will be given*

Answer 1

If the smaller phone can accept nanoSIMs yea. More than likely though you'd have to use an adapter to get it to fit securely into the phone.

Answer 2

If the smaller AT&T phone uses the Nano SIM, then yes. But you didn't tell us what other AT&T phone you have. Not all phones use the same type of SIM card size.

Answer 3

It helps to know the make and model of the phone, not the carrier.