How to get past iPhone Emergency Call Screen

The following steps have been tested to work with iPhone 4, iPhone 3GS, iPhone 3G and iPhone 2G.

To do so you will need an already activated AT&T Sim card. If the sim card has not already been activated, a.k.a, brand new sim card, it will not work. You may purchase one easily from eBay.

• Power on the iPhone
• Start iTunes on your computer
• At the Emergency call screen, insert the sim card into the iPhone.
• Connect the iPhone to computer via USB cable.
• Wait 2 minutes or so.
• It should get past the emergency call screen. If it does not, disconnect the USB cable and reconnect. It should work then.
  

Now you have an iPhone with all features enabled. You can get to the main menu and download apps, music and play games like an iPod Touch.

Note:

• This works for iPhones from all carriers. If the iPhone was purchased from Rogers for example, you will need a used/activated sim card from Rogers.
• The sim card must NOT have a passcode over it. Otherwise it will not work.
• if iTunes prompts you for the billing address zip code and last 4 digit of SSN number of the iPhone owner, it means that the sim card is current associated with another iPhone. You will need another sim card to activate the phone.
  

How to fix iPhone green/yellow screen

When iPhone's battery is drained, it may show the battery with a red bar to indicate that the battery is drained. When the iPhone's battery is completely depleted, sometimes the iPhone will show a green/yellow screen. And if you plug in your iPhone to the wall charger and charge it overnight, it may not even charge. Here are the steps you need to take to fix it.

• Connect iPhone with USB cable to your PC directly, without any USB hub or any other accessories (You cannot charge with wall charge, only via PC)
• Start iTunes.
• Charge the iPhone for 1 hour or so. It will come up with the boot logo. Now you can charge it with wall charger normally.
  

How to resurrect iPhone 3G stuck in Apple Logo

If you have an iPhone 3G that is jailbroken or unlocked, and you accidentally resetted the phone, it will be stuck in the Apple Logo and cannot boot up normally. Here are the steps to get past it.

• Note the iPhone firmware version that you have before you reset the phone. For example, iOS 4.0.
  
• Download the corresponding firmware for your iPhone model from here
• Edit the windows host file located in "C:\WINDOWS\system32\drivers\etc\hosts". Added the following line:
  74.208.105.171 gs.apple.com
• Connect the iPhone to the computer. Make sure the battery is charged. Turn off the iPhone. If you cannot turn it off, try hold home button + power button together for a few seconds. Release both buttons as soon as it's turned off. Otherwise the phone will boot up again.
• Start iTunes. Enter DFU mode.
  Watch instruction video here
• Hold shift and click restore in iTunes. Choose the firmware you just downloaded and restore to the firmware version.
• After restore is complete. You can attempt to re-jailbreak and re-unlock your iPhone
  

Note:

• You can try the same steps for resurrecting your iPhone 3GS or iPhone 4. However, the restore will only work when you have shsh saved.