My i message & FaceTime is not showing my phone number

Hey, i hope you are doing great, from the last year i am facing same problem with my I phone 7 & now same problem with my i phone 7 plus, I purchased used iphone 7 from pakistan & it was working perfectly. But I can't able to iMessage and FaceTime with anyone from my number, my email 'ahsankhan.ahmed1@icloud.com' is showing as a sender and receiver address instead of my number, when i got stuck at that point i sold my phone to my relative, he changed his apple id & that time he was successful to iMessage anyone showing his number instead of his email. For now I switched my phone from iphone 7 to iphone 7 plus, I updated my software to the lastest version, i changed my carrier, i changed time zone (auto time zone & manual selection), also changed my privacy settings, i reset my all network settings, and I waited for 1 day for activation of iMessage, but that doesn't works, i called my carrier asked them for help they said 'from our side it is cleared' i want to iMessage & FaceTime people with my mobile number cause they have my number instead of sending messages from my id. Kindly do lemme know what else method i can do thanks & regards