I have a really weird problem with my iPhone 5S. (iOS 7.1) 1. When I am on a call, I am not able to pick up a second call that is on wait. I can see the second call, I can hear the beep sounds but as soon as I pick up, the call freezes in 00.00 time, and My first caller is still active, not on hold. 2. When I am on a call, I am not able to make a second call placing the first call on hold. The second call disconnects immediately with 3 beeps. 3. I am able to see the incoming calls on wait, when I am already on a call. I am able to hear the beeps coming in. SO it means the call waiting is on (Tried turning it on/off/on too.) But when I pick up the call, the above problem comes in. What have I tried to solve this: (None of them helped) 1. I tried a hard reset of my iPhone (Holding Power and Home button) 2. I tried toggling the Call waiting button 3. I tried resetting network settings. 4. I called my Operator for assistance. I am using Airtel, India. They told me to dial this code - *43# . I tried it and it gave me this screen. But the problem is not solved yet. Is there anybody here who is facing the same issue with your iPhone? I never had this problem with my iPhone 4.