Hi, I have purchased on Ebay an Iphone already activated. The seller the sim of the AT&T has also furnished me with which the telephone has been activated, I hold to specify that the subscription of the sim has been cancelled and that often when I turn on the Iphone it appears me the message "Incorrect Sim please reactivate with Itunes." My question is, the method "Super Sim" or that "Turbo Sim" they work equally or I have to still purchase a sim of the AT&T with the valid subscription?