Supported GSM Modems for US AT&T

I have been having difficulty getting a GSM modem working with the ServersCheck monitoring appliance. I have tried using the Huawei E8372h-608 USB modem and using AT&T Velocity USB Stick (MF861) without success. The reason why both of these modems aren't working with ServersCheck is because they are not in a GSM modem mode. There is no COM port associated with both of these devices.

What modems have been confirmed to work with ServersCheck that will also work with US AT&T cell service? I have seen that the Huawei E3276 may work but I want to find out for sure before I purchase the Huawei E3276.


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