UPDATE Ars Technica confirmed with AT&T spokesperson Seth Bloom, the qualifying voice plans include Nation 450 and 900, or FamilyTalk 700 or higher.
UPDATE 2 BGR got their hands on the internal memo with the details:
Looks like AT&T is getting a bit more nervous about losing its precious iPhone subscribers, with their above average monthly bills, to Verizon.
According to AT&T, unlimited calling to any mobile number is available to customers with an unlimited messaging plan and a qualifying voice plan. You’ll have to check to see if your current voice plan is supported for the new feature.
You can check if qualify for this new plan starting tomorrow on AT&T website: http://www.att.com/anymobile
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