T-mobile iPhone calls hang up after 4 hours?

Everytime I'm on the phone with anyone over 4 hours 1min and 34 seconds it automatically hangs up I have a new iPhone 5s with a T-mobile contract my mom didn't set up a call time limit or anything how can I fix this

Stop talking so much. I would not want to listen to anyone run their mouth for more than 10 minutes let alone 4 hours.

Not sure how, but maybe you should make shorter calls like normal people, maybe it is time to grow up a little, no one need to make calls over 2 hours let alone 4 or 5.

Well first of all, I don't T-Mobile thought you made very LONG calls like that. The average person calls for about 30 minutes and thats about it. So they might have set that limit or else it could maybe screw up your phone of some sort? I know my phone overheated once for being on way too long, and I was calling my friend for about 4 hours too.

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