Carrier is Airvoice Wireless. Runs on AT&T Network. You can use any AT&T phone or any unlocked GSM like T-Mobile.
Great company, I'm with them about a year, never had any problems. It's prepaid and the company is in U.S. with regular English-
speaking Americans answering the phones. They have data plans as well, but this $30 plan is just unlimited talk n text.
I'm an authorized dealer.