Unable to call FaceTime only to a particular caller ID I am using iPhone 4 with iOS 6, and my boyfriend is using iPhone 5 with iOS 6 (recently upgraded to iOS 7).

Whenever I called him from my iPhone, it would say "Connecting..." when he picked up, and then after a few seconds it would say "Connection Lost". I tried a lot of times and it never worked.

Then I have my Mac setup with Facetime, and I was able to call his phone. And then I tried to use my iPhone to call my Mac (different ID), and it was connected. And then I tried to use my iPhone to call a friend's iPhone 4, and it also worked. So the problem is not on the iPhone.

So here's the summary:


iPhone 4 calling iPhone 5 didn't work
Mac calling iPhone 5 worked
iPhone 4 calling another iPhone 4 worked
iPhone 4 calling Mac worked


Any idea?
FaceTime requires a very strong network connection, so I believe your issue has less to do with the device, and more to do with the type of connections you trying to use.

FaceTime works best with a solid wifi connection on both ends, or at least LTE. If either device is trying to use 3G or 4G, you will struggle to establish or maintain a decent connection.

To test this, I would ensure you are both on a good wifi connection and try it again to see how it works. If not, then you have deeper compatibility issues.

P.S. I would recommend upgrading your iPhone 4 to iOS 7.1. It has improved performance over 7.0.x and will help alleviate further compatibility issues.