GoBeyondWireless the prepaid wireless service uses airtime cards that never expire. You must place or receive one call every 60 days. Therefore, assuming you only use the phone for 8 minutes each month, a $10 airtime card will last you 10 months that averages $1 month (taxes included)! They use the Cingular AT&T TDMA network including coverage across the US.
For more information:
Go Beyond Wireless Website:click here
More discount wireless plans:click here

Cingular Wireless resells it's TDMA phone service through other companies like Airvoice and CallPlus wireless. Effective 1/31/2006, they will no longer activate new accounts on their TDMA network. They will continue to recharge existing TDMA customer's accounts.
For more information:
Cingular info at TDMAphone.com:click here
Other Prepaid Wireless Services:www.WirelessFlatRate.com