Liberty Wireless and Venture Mobile both offer prepaid cell phone service. Most of these plans give you a free cell phone if you spend enough money with them, or offer you your purchase price back if you stay with their wireless service for a minimum amount of time.
Prepaid Cell Phone Plans From Liberty Wireless and Venture Mobile
Neither one of these companies offer family plans. Both of these companies offer free cell phones with no monthly contract.
Pay As You Go Wireless Phone Plans
Here is an example of the current pay as you go cellular offers from Venture Mobile & Liberty Wireless:
Straight Talk Wireless Prepaid Family Cell Phone Plans from Straighttalk.com