Phone (Calling & Dialer) App Nahi Chal Raha Hai | Phone Call App Open Nahi Ho Raha Hai - Not Working

Queries : 1) phone call app open nahi ho raha hai 2) phone (calling and dialer) app chal nahi raha hai or khul nahi raha hai 3) dialer app not working on android 4) phone app not working on android 5) dialer kaam nahi kar raha hai 6) phone dialer not opening on android 7) phone app not opening android