HT201559: Restart your iPhone, iPad, or iPod touch
Learn about Restart your iPhone, iPad, or iPod touch
Q: How can I change an i cloud account on a phone?
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Nov 30, 2014 12:59 PMby wegras,On his iPhone turn off find my iPhone and then start again by restoring as new
and this describes what you have to do ,same as your scenario in reality
What to do before selling or giving away your iPhone, iPad, or iPod touch - Apple Support
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Nov 30, 2014 1:47 PMby wegras,If you bother to read the document I have linked above you will find specific instructions ,which is why I provided the link!
and yes it will wipe the iPhone clean .Back it up first despite having the same Apple id it should be named something different to the other iPhones
as in Bob'5c verses yours which hopefully is something different
Back up and restore your iPhone, iPad, or iPod touch using iCloud or iTunes - Apple Support
Another link to instructions
