Prepaid phone MVNO Straight Talk is opening up its SIM card options today by offering the smallest of the bunch, Nano SIMs, for anyone bringing their own phone to the network. More and more popular devices — such as the Moto X, new Droids and recent iPhones — are taking advantage of the smaller SIM form factor, previously forcing folks to purchase Micro SIMs and cut them down to size manually.


    



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