Device Help Apple iPhone 4 (iOS4) Calls and voicemail
Apple iPhone 4 (iOS4)

Apple iPhone 4 (iOS4)

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Checking data usage on my mobile phone

Ending active applications on my mobile phone

Setting date and time for my mobile phone

Changing my mobile phone PIN

Turning my mobile phone PIN on or off

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Getting started

Basic functions

Calls and voicemail

Messaging

Apps and media

Connectivity

Calls and voicemail

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Troubleshooting

I can't make voice calls
I can't receive any calls
I can't receive messages on my voicemail
I can't check my voicemail

Network

Turning flight mode on my mobile phone on or off
Choosing a network for my mobile phone
Choosing network mode for my mobile phone

Making calls

Making a call with my mobile phone
Making a call with hidden caller identification
Using call waiting on my mobile phone
Turning call waiting on my mobile phone on or off
Answering a call on my mobile phone
Making a video call with my mobile phone
Turning caller identification on my mobile phone on or off
Diverting calls to another number

Contacts

Copying contacts between my mobile phone and SIM
Creating a contact for my mobile phone

Voicemail

Saving my voicemail number
Calling my voicemail
Diverting calls to my voicemail
Cancelling all diverts on my mobile phone

Video guides

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Media guides

Clean up and Speed up your Smartphone Can't make or receive calls from your Smartphone? Can't use mobile data on your Smartphone? Can't connect to WiFi on your Smartphone? Slow mobile internet on your Smartphone? Slow WiFi connection on your Smartphone? Keeping your Smartphone Safe