If this doesn't work , check your APN and make sure it is the Exact as your carrier 's APN settings. If not ,you will push the +plus sign and add it and save. Make sure it saves . Than restart phone. That was my problem w Internet data not working.
Do u know what's the problem on my oneplus A6T , no wifi no data or simcard detect and it's automatic off and on ,do u know what is the problem on it and how to fix it pls?