Apple iphone 3g 16gb Guida Utente

Troubleshooting 

Yahoo! Address Book doesn’t allow contacts containing a Messenger ID to be deleted 
through syncing. To delete a contact containing a Messenger ID, log in to your Yahoo! 
account online and delete the contact using Yahoo! Address Book. 

Phone and Voicemail 

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Check the cell signal   icon in the status bar at the top of the screen. If there are no 
bars, or if it says “No service,” try moving to a different location. If you’re indoors, try 
going outdoors or moving closer to a window. 

  

Check to make sure you’re in an area with network coverage. Go to your carrier’s 
website to see network coverage areas. 

  

Make sure airplane mode isn’t on. From the Home screen choose Settings, then turn 
airplane mode off. If that doesn’t work, turn airplane mode on, wait 15 seconds, then 
turn airplane mode off again. 

  

Turn iPhone off and back on again. Press and hold the Sleep/Wake button on top of 
iPhone for a few seconds until a red slider appears, then drag the slider. Then press 
and hold the Sleep/Wake button until the Apple logo appears. Tap Unlock and enter 
your SIM’s PIN if the SIM is locked. 

If you enter the PIN incorrectly three times, you may need to contact 

your carrier for a Personal Unlocking Key (PUK) to enable your SIM card again. 

  

There may be a problem with your wireless service. Call your carrier or go to your 
carrier’s website. 

  

Restore the iPhone software. See “ Updating and Restoring iPhone Software” on 
page 140. 

iPhone doesn’t support calling over Wi-Fi. 

Visual Voicemail is delivered over the cellular data network or a Wi-Fi connection. 
Because Data Roaming is turned off by default, you may not have access to the 
Internet when traveling abroad unless you turn Data Roaming on or connect to a Wi-Fi 
network. To turn Data Roaming on, in Settings choose General > Network and tap Data 
Roaming. Data roaming charges may apply. 

Data roaming charges may apply. To avoid data roaming charges, turn Data 

Roaming off.