AT&T begins offering unlimited mobile-to-mobile calling
Similar to Sprint's service, this is to any carrier. Topping Sprint's service, however, AT&T still has their A-List which allows a certain number of "favorites" to which unlimited calling is allowed, even to wired lines. Of course, there are caveats. To get the free mobile-to-mobile calling, you have to subscribe to unlimited text messaging. Unlimited messaging costs $20 per month on an individual plan or $30 per month on a FamilyTalk Plan, which allows for up to five lines.
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It's an incentive, and it's a nice plus for those staying with AT&T. It's probably not going to be as big a splash as the Verizon iPhone hitting stores, however. It's also not going to affect the lines that are already greeting Verizon and other retailer storefronts in parts of the country.