Apple A1241 User Manual

Reset iPhone settings. From the Home screen choose Settings > General > Reset 

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> Reset All Settings. All your preferences are reset, but your data and media aren’t 
deleted.
If that doesn’t work, erase all content on iPhone. See “

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Resetting iPhone” on page 149.

If that doesn’t work, restore the iPhone software. See “

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iPhone Software” on page 204.

Make sure the dock connector is free of debris.

If you connect iPhone to an accessory not specifically made for it, iPhone may ask 
if you want to turn on airplane mode. This is to eliminate radio interference from 
cellular signals coming from iPhone. You may be able to use iPhone with the accessory 
whether or not you turn on airplane mode. However, the accessory may not charge 
iPhone.

If you turn on airplane mode, you won’t be able to make calls, send or receive 
text messages, access the Internet, or use Bluetooth devices with iPhone until you 
disconnect iPhone from the accessory or turn off airplane mode.

The accessory you attached may not work with iPhone. Make sure the dock connector 
is free of debris.

iPhone needs to be activated. Connect iPhone to your computer and open iTunes if it 
doesn’t open automatically.

If the interior temperature of iPhone 3G or later exceeds normal operating 
temperatures, you may experience the following as it attempts to regulate its 
temperature:

iPhone stops charging

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the display dims

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the cellular signal is weak

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a temperature warning screen appears

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You cannot use iPhone while the temperature warning screen is displayed 

except to make an emergency call. If none of the above measures succeeds in 
lowering the internal temperature, iPhone automatically goes into a deep sleep mode 
until it cools. You cannot make an emergency call when iPhone is in this mode. Move 
iPhone to a cooler location and wait a few minutes before trying to use iPhone again.

Troubleshooting