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GL-X750v2 got ATT IoT certificate, you can follow this article to learn how to use the ATT network: How To Set Up AT&T IoT SIM Card On Spitz (GL-X750V2) - GL.iNet
I’m not sure why you need to change IMEI, but the sim card should be ATT IoT data card. If you use normal ATT sim card, you can activate the sim by using your phone. Then, you need to insert the card back to X750v2, and It usually works.
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