Calls has poor quality to landline but fine for mobile numbers

[AsemAlhaji]

Hello,

Anyone has any idea on the issue I am facing. It has be going for really long time. When I call any other mobile number there is no issue with the call but if I call any landline number, the call has a poor quality and my voice has drops in the speech so the person in the other side doesn't hear the full word and I struggle to pass any useful information. This issue happens to any landline number and happens wherever I am located in UK.

Thanks.

[PeteG]

Hello, Asem. 

Ah, that's quite an odd issue to be experiencing. Since you can make calls to mobiles without the issue, it sounds like your phone and signal are good. Could you try testing a call to a landline again, but before doing so, make sure to turn off your Wifi calling, or if it's easier, just turn off Wifi. Does that change anything? 

Pete.