AT&T/GoPhone has one of the largest USA wireless network. You may click here to check the coverage are of AT&T GoPhone service .
You will need an unlocked (or AT&T-locked) phone that has GSM 850/1900 bands. All North America GSM phones feature GSM850/1900 bands. If your phone is from Europe or Asia, please confirm it is a tri-band or quad-band phone. Please check your phone models (click here) if you are not sure about your phone specs. Please note that Verizon/Sprint/Virgin Mobile phones use CDMA system so they do NOT support GSM (SIM cards), unless it is specified as an international phone. Simply insert the SIM card to your phone and turn your phone on. You should see "AT&T" on the screen in a few seconds and then it is ready to use.
AT&T GoPhone plans includes: (1) Simple Rate plan ($0.1/min), (2) Daily unlimited ($2/ day, unlimited talk and Text), (3) Monthly plans Detail as in below:
We will activated your SIM card 2-3 days before the "departure date" you entered when purchasing. If you're already in the USA, or want to activate it now, you can enter today's date and we will activate it right away. (Important: upon activation $15 refill credit expires in 30 days from that day on. $25 and $50 expires in 90 days, and $100 expires in 365 days.)