I am not able to receive calls recently but i can call out to others. After a while, then only i will receive sms notication to told me that there is a undelivered call but my phone did not show any call is coming in at all for such undelivered call. I realized when others calling me, my phone signal showed from 4G change to 3G and then change to H+. But my data plan internet connection work well and have no issue. Is there a network coverage problem with Digi recently? This only started happening last 2 weeks times. Before this, everything is ok. I did not make change in my phome configuration and did not block any numbers recently. Kindly please advise and help me to fi . Thank you very much.