Facetime for older iOS 6.x & upgrade path

I'm a newbie to iPhone & Apple products

My bro's iPhone 5 doesn't have a Facetime so I went to App Store to install one but it complains
that the version of iOS has to be 7.1.x or above.

Is there an older version of Facetime somewhere around ?  What other options other than
upgrading the iOS that I have to use use Facetime on tt phone?

If upgrading is the only option, possible to upgrade direct from 6.x to 8.x ?  Kindly provide
step by step instructions on how to upgrade without affecting/destroying the Contacts,
whatsapp / SMS messages & whatsapp groups & other apps that are currently installed
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JohnBusiness Consultant (Owner)Commented:
Install iTunes on a PC (if not already there), connect the iPhone and allow it to upgrade the IOS. I went from 6 to 7 to 8, but I think the phone should be able to go straight to 8. I have Facetime on my iPhone 4s
When you connect iPhone to iTunes, a backup of the iPhone it will be made. Upgrade the iOS. Always the latest  iOS version will be installed which is now 8.3, You cannot install even if you ... beg :) another version than the latest.

After the upgrade you have to choose how the phone will be set. Select recover from iTunes backup. All the contacts, photos and applications will be in place

Best regards!

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sunhuxAuthor Commented:
Bear with my noviceness,
Possible to take a couple of screen shots to attach here of what to click in the latest iTunes to upgrade the
iOS & how to activate the backups?  Was told by a colleague the iTunes interface/screen looks very
different from 3 years ago iTunes
sunhuxAuthor Commented:
I'm also curious how did Facetime went "missing" on my bro's iPhone 5 (which I tot all iPhones
come with Facetime by default) or did I just fails to locate it?  I'll take photo to attach in this thread
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