Problem with some calls. Calls won’t connect

SomCalls won’t connect

Tonyh Are there any commonalities when the calls wont connect such as your location or the numbers that you're trying to reach?

The numbers I try to connect to are local,some just go straight to call ended others ring and when the the number I have called answers I can’t hear them and they can’t hear me. I have spoken to Lebara staff they do help but works for a short period of time. Also if I turn my WiFi of and Bluetooth it seams to work