HT4623 After update iOS 6, my iphone wi-fi slow down than before update and down wi-fi stability.

its same settings before update ios 6 but i've often connection lost problem. May be new update necessary ! . i tryed soft reset, wi-fi connect reset but the problem continues.
How can i fx that issue.
by the way,
"THANKS STEVE, THANKS APPLE"
i love Apple world at all
cheers

That's almost always symptomatic of a phone that was hacked to unlock it and then updated or restored.

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