I need help connecting my 3G/4G hat from sixfab to the AT&T network.

[/RaspberryPi]

I have bought a prepaid AT&T sim card from Walmart and added service to the account. The telit LE910C4-NF module that I am using is plugged into a sixfab 3G/4G Hat on my raspberry pi. When I try to send SMS messages or connect to the network with the apn name NXTGENPHONE. The module times out. I'm not sure what I'm doing wrong or what I can do to get it to connect and send messages. If anyone could help me I would greatly appreciate it.
submitted by /u/Aut1sm_Spout
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Source: https://www.reddit.com/r/raspberry_pi/c ... sixfab_to/