Could it be that the phones are hacked and someone in another country signed on to our phones ?
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Could it be that the phones are hacked and someone in another country signed on to our phones ?
If it's a one hour change, and you're near a timezone border, you could be switching between a tower in one zone and a tower in the other zone. (The time, if it's set to automatic, is the time at the tower [the date and timezone too].)
If not, the most likely explanation is corrupt firmware. Hacking comes a very distant - about 25th place on the list of things it could be. Why would anyone hack your phone to change the timezone?