Device Guides
Apple iPhone 5
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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.

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How to
Merging identical contacts on my mobile phone
When you copy your contacts from social network sites to your address book, the same contact may be displayed more than once. You can merge identical contacts so they will appear only once.
Tap Extras.
Tap Contacts.
Tap the required contact.
Tap Edit.
Tap link contacts....
Tap the required contact.
Tap Link to merge the contacts.
Tap Done.
Tap the Home key to return to the home screen.