On March 6th 2015 i inserted a T-Mobile and AT&T sim on an unlocked Verizon 4S and to my surprise it activated. About 3 weeks ago when i tried that it told me that the sim inserted was not a supported sim under the activation policy. Something must have changed, can someone with an unlocked 4S try and see if it would activate with either a T-Mobile/AT&T sim? Also the same happened with an unlocked sprint iphone 5