Q: incoming calls ring on multiple phone numbers

Settings, Face Time, iPhone Cellular calls to Off on their phones.  You should also consider getting them their own appleID's for iCloud before they erase your contacts.

I have this same issue between my iPhones (5S and 5C), but they are legitimate phones with their own numbers, so ssschmidt's reply doesn't help with that.

Hi Lorifromla and ssschmidt

I have the same problem, 2 x iPhone 5 with their own vodafone numbers and apple ids. However for a long time we have used my appleid (iCloud) on all devices so we have shared calendar and contacts.  We have separate email accounts.  This has worked fine up until now.

Since upgrade to IOS8 they now both ring simultaneously when either is dialled.

I will try the FaceTime suggestion but if anyone else either experiences this problem or has a fix it would be welcome.

I think I finally found the solution:  Settings -> General -> Handoff & Suggested Apps, then turn off Handoff.

Apple should have made it default to off (and certainly explained Handoff better).

I have had this problem aswell both on sms and calls since update 8.  But as i turned off FaceTime (Settings>FaceTime> and turn off on both/all phones) and the Handoff setting turned off as described above.

GL

Do you have same apple id on both phones? I also had different numbers but same apple id but this helped me. Also had the same with text msg

I have a question for everyone. When does this happen? Is everyone in the same house, or the same location? OK...guess that was two questions. Might as well make it a couple more.....   Did this same issue occur to anyone before the iOS 8.x.x update, or moving to a new iOS device?

I have friends that this is happening to and I've looked everywhere posted above, but the only time that this occurs is when they are in the same house. If I call person A while person B is in a different geographical location on caller A's phone will ring. They are also on the same wireless carrier.

It happens across devices using the same Apple ID, it is not location based (though the devices also have to be in close proximity for it to work).

It did not happen before the iOS 8 update because it is a new feature introduced in iOS 8: https://www.apple.com/ios/whats-new/continuity/.

I understand the continuity feature in iOS 8.....the problem is one of the devices is still on iOS 7

Then the caller probably placed a FaceTime Audio call, not a regular phone call.

Are you positive the device in question is running iOS 7? Settings > General > About > Version.

I had the same problem with my kids phone, since we are using the same AppleID for iCloud on both devices. You can change AppleID on each phone to eliminate this problem.  Or...

Go to Settings > FaceTime, Turn off the iPhone Cellular Calls option.

This allows all other app functions to work on each person's phone (i.e. FaceTime, Handoff, etc.).

Hope this helps others.

Yes, absolutely sure one is running iOS 7 and the other iOS 8.x.

I'm doing some additional testing. FaceTime isnt setup on either device ...

Go to Settings>facetime> untick iPhone cellular calls.

You're welcome.

I Just gave my daughter her own Apple ID but I manage the password and account.  That way there's no possibility of altering data on each device.