While the X750v2 is considered not compatible with either of those networks, if you check the IMEI they may say it is invalid.
TMobile will accept the IMEI, perhaps, but ATT & Cricket will not.
This is because the check digit on the IMEI is incorrect.
I bought the AT&T Certified SPITZ v2, and when I checked the IMEI while signing up. They said it was invalid.
After doing research, I learned that the IMEI’s last digit is a “check” digit and follows the Luhn algorithm.
As explained here:
The IMEI that came with my SPITZ had the wrong digit at the end.
I calculated the correct check digit and tried the IMEI again, replacing the last digit with the correct one, and the IMEI was no longer considered invalid.
They still rejected the device as being incompatible with their network (both ATT and Cricket).
However, if you get a new device and cannot sign up due to an invalid IMEI, follow these instructions:
Copy all the digits of your IMEI except the last digit. (e.g., 49015420323751? )
Starting from the right, double a digit every two digits (e.g., 5 → 10)
Add all the individual digits together (e.g., 10 should be considered 1 + 0)
4 + (1 + 8) + 0 + 2 + 5 + 8 + 2 + 0 + 3 + 4 + 3 + (1 + 4) + 5 + 2 + ? = 52 + ?
When you have your total, round up to a number divisible by 10 (e.g., 52 up to 60).
Subtract your total from the rounded up number (e.g., 60-52 = 8).
The result is the “check digit”.
Take the first 14 digits of your IMEI and put the check digit at the end (e.g., 490154203237518)
That will be a valid IMEI and can now be checked with the provider.
If you check your IMEI with Cricket and it says Imei is invalid then this may be your issue.
If you do correct the check digit with Cricket, you will then get an error that says:
Apologies! This 4G LTE Wireless Gateway GL-X750V2C4 is not compatible with the Cricket Network due to network changes.
While you still cannot sign up for service with Cricket, the IMEI is now valid and your device is properly identified.
Hope this helps.