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I have T mobile and the coverage on the base is not that good. Out in town it works fine, but I have trouble every now and then on base. It worked most of the time during OCS.
You can keep them in your car. Cell phone coverage on base will not be good because of all the radars and other high-powered electrical equipment around. Get a Costco prepaid calling card and bring it with you in the event your cell phone doesn't work. Then you can at least use a landline from the exchange or wherever to make a call.
Actually they just put a new tower up right on base or right outside of it. I think it's either All-tel or AT&T, but I'm not positive. I do know it's not sprint however, because my service still blows.
I had Verizon while at OCS - worked GREAT from the rooms in Batt 1...not that I'm advocating having a cell phone at OCS or anything...contraband, you know...