I have a 5S and 6+, both have the same apple i.d. account. I noticed that I can't make VIBER calls or receive calls on my 6+. Yesterday, a viber incoming call came in on my 5S, but not on the 6+. I had both phones on me. Minutes later, a Viber call registered on my 6+ and not the 5S. Should I only have one account registered to one phone. An ATT sim was in my 6+, but the 5S was simless. Do I need to restore and reset my 5S so that there is no link of my apple i.d. account on it? I'm thinking, having the same account on both phones is confusing Viber as to which incoming call it should register it to - 5S or 6+. And may be the reason why I can't make outgoing calls on my 6+ via Viber.