iPhone 4 Signal Issues after activating Airplane Mode or SIM Chip Removal

A new bug found this week my Griffin Concepts/ Springfield iPhone repair, was when activating 'Airplane Mode'. It appears that when this is activated, or when the SIM Chip has been removed, the iPhone can not only not pick up valid signal, but even crash and reboot!

Symptoms:
iPhone 4 - activated Airplane Mode. iPhone appeared to have frozen for a few minutes, and then rebooted on it's own. After later tests I found that music that was playing while activating the switch would continue playing, until the iPhone 4 reset itself. Even after reboot, the iPhone would not seem to pick up signal. On the occasion that it would (after disabling Airplane Mode of course) no phone calls could be made, texts be sent, or received. Troubleshooting steps: Reset Network Settings (Did not work). Reset All Settings (DID WORK).

iPhone 4 - Removal of SIM Chip, and putting it back in: No service, or iPhone shows service without the ability to place or receive calls or texts. Again, the only successful method was to reset all settings (resetting network settings did not work)

SETTINGS > GENERAL > RESET > RESET ALL SETTINGS

How to clean your Headphone Jack

2G, 3G, 3GS and iPhone 4 headphone jacks can get dirty, grimy, corroded and/or filled with lint, which can hamper you getting the full use of your iPhone. Symptoms that may be resolved by cleaning your iPhone headphone jack is...

• the headphone jack won't fit down all the way*
  
• Sound only coming out one side or speaker
  
• Moving the headphone jack makes audio go in/out
• Earpiece doesn't work during Phone Calls (test by hitting the volume keys while the iPhone is unlocked: if the iPhone indicates that you are changing the heaphone volume and not the ringer volume, it thinks something is plugged in when there is not! )
• You can see dust/lint inside the headphone jack.
  

How can you resolved that?

Our recommendation is two-part:

• Take a needle and pic out what dust, dirt and lint you can out of the headphone jack
  
• Take a Q-tip and pull off some of the cotton (about half from a name-brand Q-tip) and twist the remaining cotton around the stick. Make sure it's small enough that you do not have to jam it in the jack, but large enough that when you spin it, it can clean the contacts inside the headphone jack.

DO NOT GET THE Q-TIP WET WITH WATER OR ANY CLEANER AS THIS CAN SHORT OUT DIODES NEAR THE JACK AND PERMANENTLY HAMPER OPERATION, TURN THE LIQUID INDICATOR INSIDE THE HEADPHONE JACK RED AND INVALIDATE THE WARRANTY!!!

* except for 2G iPhones that have a recessed headphone jack, you might need an adapter for non-standard iPhone headphones.

If cleaning your iPhone headphone jack did not help, check out these replacement services:
iPhone 3GS Headphone Flex
iPhone 3G Headphone Flex

Restore from update...

Lets say you have been using an iPhone for a while now, but you upgraded your phone to another used phone and want to put you data on the phone without 'restoring' the software... (many people do not want to update as they will loose the jailbreak... esp if you have a 3GS, you could really mess up and be stuck with a locked phone for a while).

Well it's easy... Connect the iPhone to iTunes and right-click (Option+Click) the iPhone name and get the option to "restore from backup..."

Likely it will not give you the update times of the backups, but the top option will be the most recent. It helps if you BACKUP your old phone before doing this.