How to Fix Youtube WiFi GPS Problem on iPhone 3.1.2 Firmware

Method 1- Reset Network Settings:
Step 1: On iPhone 3G and 3GS, go to Settings –> General –> Reset –> Reset Network Settings.
Step 2: A dialog will prompt with “Reset Network Settings”
Step 3: Hit this button and turn off your iPhone by holding down power button on the top and then slide to turn off your phone
Step 4: turn on your iPhone by holding down the power button on the top again until you see the Apple logo.
Resetting your network setting will fix your WiFi problem temporarily. The problem will come back when your iPhone rebooted . You will have to reset your network settings every time you reboot your iPhone.

Method 2: Install Push Fix App
Push Fix app from Cydia is used to fix Push Notifications on iPhone 3.1.x firmware.
Installing this app also fixes all issues caused to WiFi, Youtube app and GPS along with Push Notifications on hacktivated iPhone’s.
steps to install Push Fix app:
Step 1: First reset your network settings as mentioned above to bring back WiFi
Step 2: start “Cydia” Touch on “Manage” tab on the bottom and then on “Sources”
Step 3: Touch on “Edit” and then on “Add”. You will be prompted to enter a url source
Type “http://cydia.iphoneil.net” and touch on “Add Source”.
Cydia will now automatically update your sources .
Step 4: After installation is completed. Search for “Push Fix” in Cydia and install this application. This app will automatically fix Push Notification System on your unlocked and jailbroken iPhone.
Install Push Fix App
Step 5: Restart you iPhone
Enjoy