If you have WiFi problems and are running blacksn0w on a 3G or 3GS, please see my update to blacksn0w that fixes all known WiFi problems with it. http://pushfix.info/forum/viewtopic.php?f=3&t=203
GPS : If you have applied my YouTube Fix packages on my source and GPS still doesn't work, you are suffering from a bug.
UPDATE Jan 16, 2010: New procedure as submitted by a user (thanks radiosky).
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1)go to map application, your gps is not locking on...
2)push power button 5 sec to see power off notification
3)release power button and push and hold home button until maps application will close. it can take a while.
4) wait a few moments and run your maps again. within few sec your gps will working ...
UPDATE Jan 4, 2010 : New procedure to attempt to fix GPS. This has restored GPS for 2 users so far.
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Turn off Location Services in Settings and then turn off your phone. Turn the phone back on and wait a couple minutes after it comes back to the home screen. Then, turn Location Services back ON. Next, go to Maps and leave it sit there until you get the pulsating dot. Your phone should sit upright against a wall or window while doing this. It is also ok if it is sitting in a dock (upright).
WiFi : If your WiFi does not work or you get very low bars, you are suffering from a bug.
Sometimes a restore fixes it and sometimes it doesn't and it is "permanent". For users under warranty, Apple does replace phones with WiFi problems, so it is my opinion they are aware of a problem.
I have seen this happen mostly for users who have restored their phones a large number of times, say 20+ times. A few users have had it happen on the first restore. I estimate there is a 1% chance of getting the bug between all users out there restoring.
Another user responded to a comment I posted on RedmondPie.com. I was talking about GPS, but the user responded with a problem with WiFi.
My post : Pushfix 2.0 doesn't fix GPS - I provide a free fix for that. You can add my source, cydia.pushfix.info and install one of my free YouTube Fix packages. If they don't fix your GPS, then you are suffering from an Apple bug. You could also try resetting your network settings, but be careful as this causes some people to go into a constant reboot loop. That's when you know for sure you are experiencing the bug.
Reply from "Cristian" : Please listen to the guy!! I had to restore twice due to this bug. Basically I can no longer turn off my phone, because it kills wi-fi. If I restore network settings, it enters an infinite loop when restarting and it's game over!
I can say that Apple should be aware of this problem.
http://discussions.info.apple.com/threa ... 5&tstart=0
& 2009 (300+ replies from non-jailbroken customers)
http://discussions.apple.com/thread.jsp ... &tstart=30
Geohot offered to fix it for them for $10,000.
http://modmyi.com/forums/mac-news/69150 ... 000-a.html
As many users noted the issue after upgrading to 3.1.2 and subsequently unlocking and/or jailbreaking their iPhones, there was a concern that the hacks themselves could have introduced a problem. After seeing the volume of complaints from users of stock iPhones, however, Hotz concluded that his hack was not at fault.
Added : SBSettings causing GPS to fail to lock (3.1.2) @ macrumors.com http://forums.macrumors.com/showthread.php?t=822191