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How does wifi works in iPhone 3G

i had wifi in my i phone 3g. And i have use it but now it is not working

plz help me to find why the reason is

Answered! View the answer I have this problem too

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have you changed or downloaded any of your software settings? try doing a restore to software you know you had working wifi with.

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Their is a small flex cable at the top left of the iphone that runs to the wifi antenna. It connects to the mother board in the top left, next to the other flex cable. if this connection isn't being made the wifi won't work. check that it is firmly down and wifi should be up and running.

iFixit has plenty of repair content on this issue.

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bhagya will be eternally grateful.
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