Wireless Joint

Hello,
Would recommend reading these two current posts to start.
https://wirelessjoint.com/viewtopic.php?f=8&t=1257
https://wirelessjoint.com/viewtopic.php?f=15&t=1208
Out of the three you have if you are asking which is more advanced and faster that wold be the Quectel EM20-G.

The Quectel EM20G, a category 20 modem, is a much more powerful modem. Most of the modem isn't utilized, EXCEPT it has 4 antenna ports to be able to use 4x mimo versus 2x mimo like the other cards you listed. Quectel DOES make a cat12 modem, like the two Sierras you noted. Unsurprisingly, it's ...

Post a copy of your full "System Log" here after you fully boot up and it tried to connect for a little while. It's along bit of text.

Also what cellular carrier are you using and what plan with that carrier. I'm not familiar with Cyberonic. You may want to contact your cellular provider and ask if ...

I purchased an EM20-G and NEXQ6GO in late May from The Wireless Haven and thanks to everyone here I have been able to have a useable broadband internet connection. I know the NEXQ6GO is not recommended for this modem but my hopes were slim as before due to poor signal levels and a congested tower ...

The network is declining your connection. It may be the APNs need to be cleared out (AT+CGDCONT=1; AT+CGDCONT=2; AT+CGDCONT=3) Then set the APN manually ( AT+CGDCONT=1,"IPV4V6","broadband" ) or try IPV4 only (AT+CGDCONT=1,"IPV4","broadband")

But it looks like an account issue.