Calls keep dropping
Hi,
I'm having problems with calls keeping dropping, it happens at random times, it happens pretty much every day but sometimes it will happen just 3 minutes in to the call and sometimes it can last a whole hour conversation before dropping out, after dropping the call it will not allow me to ring the other person back, it just goes straight to voicemail, and if they try to call me it goes straight to voicemail for them also. The majority of the time if I turn my phone on and off again, it will allow me to call them back, which suggests to me that this could be an issue with my phone as turning it off and on again seems to make it work again, although it could possibly be a problem with my network but I'm not sure as I've never experienced anything like this before, any ideas?
iphone 5s latest os
Cheers
iPhone 5s, iOS 8.3