Call is disconnected after few seconds
Every time I try to make a call or receive a call - after few seconds - people stop hearing me and it gets disconnected. I can't remember the last time I had a phone call that lasted for more than a minute. I sent my phone to be prepared multiple times and they don't seem to know how to solve the problem - or they solve it and the same problem reoccurs.
I really need to know if there is a hope to fix this problem. I used to think the main problem is with the service/reception area, but sometimes I'm in a place with full reception and it keeps disconnecting.
My mobile data works perfectly fine, so I know it's not a SIM problem and making phone calls on other devices using the same SIM seems to work.
If this problem is already discussed on this board please provide me a link, I can't find a solution all over the internet.