Sprint and T-Mobile followed LG's debut of the G4 smartphone with details of their own launch plans. Sprint said it will offer the G4 in black leather and metallic gray. T-Mobile didn't specify which colors it will offer, but is kicking off a preview program for the phone that will let consumers try the device for free. The program is officially a sweepstakes being run by T-Mobile, and it will give away a G4 once per day until the phone reaches stores. Neither Sprint nor T-Mobile said how much they'll charge for the LG G4, but said the device isn't expected to reach carrier stores until June.


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