So today I was on a regular phone call and noticed that my cellular data signal has vanished. I normally get strong 3G in this area, bit when I tried to get on the web whilst still talking on the phone I just got a message saying "cellular data is not available on this call". I've got a 5S on EE, but I'm sure that I used to get 3G signal whilst calling on my iPhone 5. I'm aware that 4g is data only, and my 5 used to drop from 4 to 3G when calling someone, but I find it odd that my data signal vanishes entirely now on my iPhone 5S. Anyone else seen this?