Why wont my sim card work?

[Android Central Question]

I just got a cubot x18 plus and have at&t as a network my number is registering correctly but I am not able to receive data or texts or calls nor can I give them. Plus help I need this phone for my jobs.

 

[B. Diddy]

Welcome to Android Central! It doesn't look like the phone supports AT&T's LTE bands:

https://www.devicespecifications.com/en/model/9123480a
https://www.frequencycheck.com/carriers/at-t-united-states

Since AT&T shut down their 2G voice network a couple of years ago, they rely on Voice over LTE. If the phone doesn't support LTE, I think that may be why you're not getting any calls or data. Although 3G should still work -- go to Settings>Mobile Networks>Preferred Network Type, and make sure it's not set to LTE only. Also, go to Network Operators and make sure AT&T is selected, and go to APN to make sure you have the correct APN settings for AT&T:

https://forums.androidcentral.com/e...l%23%21%2Fwireless%2FKM1218306&token=hfiqgyyF
https://www.androidcentral.com/what-apn-and-how-do-i-change-it