People can`t hear me while making phone calls AND connection Problems

Hey,
for me, this two problems seems like having the same background…
1.) while making phone calls, people hear a strange noise and cant hear me (nearly every second call)
I also could not receive calls sometimes.
2.) want to send a whatsapp msg but it couldn`t send it.

What I tried:
changing sim card
made a hard reset
tried sim slot 2
made all update

I think there is a problem with the connection… (data and phone connection)
this happens on different places, even countrys :wink: , so its defenitly not a local connection problem…

thanks for your help
Phil

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