Do iPhones hang up on their own for inactivity?

Well I'm asking might sound silly but because me and my girlfriend talk on the phone until we fall asleep, so we fall asleep and our phones are still on and we just listen to each other sleep. After 2-3 hours it hangs up on it's own & says "called failed" I have an iPhone 5s she had a galaxy s3. Any help

I have had many iPhones and I can tell you that I've never had any of them hang up from inactivity. I would say it's probably her phone that is going into an "inactive" mode. Although I will say that I've been on the phone or making a call and my iPhone would say "call failed" due to network or temporary bad signal.

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