Question iPad 3 trimmed micro to nano size sim card into iPhone 5 work? At&t iPad 3 works 4G so far in iPhone 5 but not 4G yet. Source found on Macrumor. In the past At&t has blocked iPad sim card into the iPhone usage and sent a SMS out to warn. They actually toke unlimited away and grandfathers away and had limits and such. Wanted to see if it would work with Verizon without limitations since under ruling that they had to allow unlocked iPhone 5's on LTE wondering if it would work with unlocked iPad 3 from them into a iPhone 5 without restrictions. Can someone verify?