Time sync gets 6 minutes wrong

Hi!
SInce a few days back, the clock on my iPhone shows 6 minutes too late. If I disable the automatic sync, I can set the time correctly, but if I re-enable the sync, it moves back 6 minutes again.
I contacted my operator, and they said that the clock that is synced againt is at Apple, but they had not heard of any other customers with this problem, so it is probably something wrong on my side. The suggested I shoul reset the iPhone to factory settings, but I would like to avoid that, especially since nothing guarantees that would help.
Anyone having ideas on what could cause this, and possible fixes? Or have similar problems?
Best regards,
Zot
BTW, my IPhone uses iOS 4.3.3, but that choice was not available in the drop-down.

Your clock is picking up the time from the cell towers, NOT Apple. The problem is your carrier.

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