A couple of weeks ago, I purchased a Spitz AX to use with an unlimited AT&T data sim I’ve had for years. It is 4g/LTE and uses the ‘broadband’ apn. I’ve used this sim in a variety of devices, the latest was the Spitz GL-X750V2.
When I first received the Spitz AX I logged in to the web console, set the admin password, set the IMEI, updated the apn to match my sim card and then powered the router off. I put my AT&T sim card in the router, powered it on and after a couple of minutes it connected to the network. I logged back in to the web console and saw there was a firmware upgrade available. I downloaded and installed the upgrade. After the upgrade, I could not connect to the AT&T network.
I took the sim card out of the Spitz AX and put it back in my Spitz GL-X750V2. I could not connect to the AT&T network using the Spitz GL. I called AT&T and found that my sim had been locked. I gave them the IMEI I was using with the Spitz GL and was able to re-connect to the AT&T network.
Over the next week or so I kept trying the sim card in the Spitz AX. I reset the router several times; tried different AT&T apns; tried various TTL settings. I searched through the GL-inet forums for a solution, but could not find one that would work or allow me to connect to the AT&T network. Frustrating.
After spending a week of trying various things I FINALLY figured out a solution. When I first got the router I think it was on firmware version June 25, 2023. I wasn’t paying close attention to what firmware the router shipped with: LESSON LEARNED - write down what firmware version the router shipped with.
This afternoon I flashed the router to the June 25, 2023 version of the firmware. Connected to the router, set the password, synced the time, set the APN. The router connected to AT&T BUT I kept getting a certificate error and could not navigate to websites.
I then downloaded and flashed the July 7, 2023 version of the firmware. Went through the same setup procedure and I was finally able to connect to AT&T and access the internet! Router worked as it should.
I then tried the September 8, 2023 version of the firmware. This one also worked.
I then tried the November 15, 2023 version of the firmware. FAIL. The router kept trying to connect but would not. I do not know why. This is exactly how the latest/December 14. 2023 firmware version acted: tried to connect but would not, repeatedly.
I re-installed the September 8, 2023 version of the firmware and could connect to the AT&T network. I don’t know what changed from the September 8, 2023 version, but it would not allow my AT&T sim to connect.
Hope this helps.