Firebase is not working in some phones

Both Firebase database and authentication is not working in some phone. at the same time it works fine in other phones. the same phone in which firebase not works now was perfectly fine yesterday. and i hadnt done any updates in app. Do any one face this issue. any solution?


hi, Thanks for reply, Before i tried this, it somehow got solved. Now it works fine. and i got a tons of varification codes as message for authentication that i had tried before. but i couldnt find the exact problem.