I made the switch almost 2 years ago to prepaid and haven't looked back!
I use puretalkusa (out of Georgia).. I had a phone that took a sim card (GSM) and I bought some used unlocked iphones and it's worked out for us. The switchover and keeping our number was a little of a wait, since we had no idea when it would exactly happen (about 1 to 3 days) and AT&T had a problem releasing our number.
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I have not needed to call Customer service for much of anything except when we were making the switch.. I waited about 5 minutes to speak to a CSR rep. I have heard that Straight Talk has up to a 45 min. wait time if you need customer service...but the prepaid company you use will depend on who has coverage in your area and what type you find acceptable for data connection.
I pay 44/ month for unlimited Talk, Text, and 1GB Data. This is the total price taxes included.... Love saving money!