No internet connection via gsm (L3) network

used to work OK , up til 1 month ago.
I’ve tried power down/power up, disable of wifi network AND power down/up several times

Hi, have you tried to change the SIM (and the operator)? Maybe someone near you can lend you one for test.

Which mobile network in which country do you mean? I can’t find what you mean by L3.

i went to France for the weekend , my mobile switched to a french service provider and I immediately got internet service. So the issue is with my local provoder JimMobile