Device Guides
Apple iPhone 5s
Change device
iOS is the operating system software installed on your iPhone. To find out which version you have: Tap Settings, Tap General, Tap About, and view the version number.

Buy now
Search in Apple iPhone 5s
How to
Choosing a default email account for my mobile phone
If you've set up more than one email account on your mobile phone, you need to select a default email account. When you write email, they'll automatically be sent from your default email account.
Tap Settings.
Tap Mail, Contacts, Calendars.
Tap Default Account.
Tap the required email account until it has been selected as the default email account.
Tap the Home key to return to the home screen.