Why does the call end after 4 hours?

Me and my boyfriend sleep on the phone at night. We both have iPhone 5's. He has Verizon and I have Sprint. Well we both have unlimited calling so we stay on the phone as much as possible. Well my phone calls cut off after 4 hours every time. Why? Like; we will be on there for 4 hours and then it will automatically hang up. But what's strange is that on both of our phones before we stayed on for 8 hours and 9 minutes. Is there a way I can fix this so I don't have to wake up every 4 hours to call him back and interrupt his sleep?

Most likely with Sprint(Sorry to say this) the network is getting all clogged up and it's bandwidth is reaching its cap. So I would consider changing providers. Happy Phoninh!
-Bob
The Friendly Man<3

I have AT&T & have the same problem

I have t mobile and same thing happens. How can you fix?!

I have AT&T and the same thing happens with my phone, is there any way to change that?

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