How much iphone 4s wifi chip cost?Still my 4s wifi is not working even though I already updated it to ios7. Thank You!!!..

You cannot replace just the chip. If all of the various solutions suggested in Apple's support documents and here in these forums do not help, you will need to 1) take or send your iPhone to Apple for replacement, 2) pay to have an unauthorized third-party shop attempt repairs, or 3) attempt repairs yourself. The latter two options will void any further support from Apple.

Regards.

Again, you cannot replace the chip. It's soldered onto the logic board. You'd have to replace the entire logic board, though without any way to diagnose the problem I can't say that is what is needed.

The wifi chip costs about $20 - $25 on ebay. there are other sources and services. some will replace the chip for you.

You may not need a chip. Reflowing the solder may do the trick. My iphone has developed this problem. I'm trying the freezing and heating, reset, and unplug the battery trick right now to see if it will get it back up and running. If not I will try to reflow the solder on the chip. Then I will consider buying a replacement chip.

This problem started a couple of months ago for me. I tried the heating as suggested and that didnt work. Then I tried the cold. It would work while it was cold but would fail as soon as it warmed up. Then I did a reset, cooled it then disconnected the battery and plugged it back in while it was cool and it started working. That lasted for a month or two then failed. Now none of the tricks work.

did you buy the chip? did you reflow the solder? did any of them work? please i need to know