Hi folks:I got the att go phone: Nokia 2720. $6.00. It came with the sim inside, BUT, it was not activated. If you follow their instructions, you're supposed to charge it, turn it on, and push the "1" button. That activates and links it to the sim. They even say that you have 36 days or so to activate or your number will no longer be held for you.
Just now I put my iPhone sim (with a micro holder) in the go phone and called a friend. No problem.
On first reading your post I was excited to have found the answer until I realized that you accomplished the opposite of what I am trying to do.
I want to use a cheap gophone pay-as-you go account with my iphone...not vice versa.
To be clear... I want to activate my gophone sim card, take it out of the gophone, put it in my iphone and make calls using my iphone at a cheaper rate than what AT&T charges for the monthly iphone account.