Weak Wifi, replaced phone from apple
hello,
my iphone 4s was replaced at an apple store long time ago.
i never used it. now im thinking of selling it and i recognized that
the wifi is only working when im next to the router.
it had ios 7 , i updated to ios8.4, but still no change.
i had a look and retightened the screws but still no use.
after research im not really sure if its a hardware or a software problem.
after all its replaced and the hardware "should" be ok.
any help?
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