Straight Talk, an MVNO that runs a bring-your-own-device service, is now offering nano SIM cards. Nano SIMs are the smallest SIM cards available, and fit devices such as the iPhone 5/5s/5c, Moto X, and select Droids. The nano SIM cards cost $6.99. Customers can buy the SIM cards directly from Straight Talk and use them in unlocked GSM handsets. Service plans for smartphones start at $45 per month and include unlimited voice minutes and messaging, and 2.5GB of high-speed data. Straight Talk's service runs on the networks of both AT&T and T-Mobile around the U.S.


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