Hi,
Please help with my question. I have problem some times my voice is slightly Breaking in other end. This is happening with some of my calls.
I also have several other turned on cell phones with SIM cards in my room.
Do they affect the quality of the call which I make on my main phone?
I’m pretty sure not, but I like to ask 
I also have some suspicion that it is the fault of my main phone.
For your understanding every phone is receiving most of the radio signals around him most of the time and continuesly doing measurements of those signals strenghts.Therefore your question regarding the interference of the receiver is answered by it I think and the answer is No.To visualize it download the app named ForceLTE which is a free android app through that you can see the radio signals currently your device is listening into.Thank you.