Apple's iphone halo has become the world's best-selling smartphone, but with the gradual listing of products more and more users have found the iphone 4S problem, foreign media today reported that the iphone 4S users sometimes do not recognize the SIM card. US iphone 4S failure The foreign media Engadget reported that a small number of users in the use of the iphone 4S when prompted not to insert a SIM card, there is no effective way to avoid intelligent restart machine. But the current situation seems to be a part of the user has been encountered and reflected in the at&t of the aftermarket, the other operators have not yet received the relevant questions. Apple and At&t are not currently making any comments on the incident, and it is not clear that the cause of iOS itself is the iphone 4S design problem.
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