Wal-Mart Stores Inc
Wal-Mart said the Straight Talk no-contract wireless offerings are an exclusive service developed with TracFone Wireless Inc, the U.S. unit of Mexican cell-phone giant America Movil
Wal-Mart was rolling out the plan nationwide after conducting a pilot program in 234 stores.
The new plans will likely put pressure on rivals Leap Wireless International Inc
(Reporting by Nicole Maestri, editing by Maureen Bavdek)