With firmware version 1.10, 2GIG provided the option to use other communication providers for the 2GIG panel.

Telguard uses POTS (telephone) to send your alarm signals and 2way voice communication from their system to the central station. This is bad, and provides subpar, slow communication services.
Quote Originally Posted by SG3VCR
Telguard/Telular receive the alarms from the 2GIG system over the Cel radio at their clearing house.

It is Telguard/Telular that then forward on to the monitoring stations the alarms.

If 2WAY voice is being used. The alarm and the 2WAY voice are sent over landlines to the monitoring station. The restoral is sent from Telular/Telguard into the station on a IP receiver. Source

Alarm.com on the other hand is much more polished and faster, and signals received from your panel are sent via encrypted IP to the central station.

Alarm.com’s module sends a digital signal via GPRS protocol to Alarm.com’s operations center.

The operations center then routes the signal over a secure, encrypted IP connection to the central station.

When the customers’ module receives confirmation back from Alarm.com’s operation center that the alarm signal went to the central station, it then initiates the voice connection allowing operators to communicate directly with the customer via two-way voice…
Not to mention, the Telguard User Interface (UI) leaves much to be desired.

Alarm.com has more peripheral device support (a larger selection of indoor/outdoor cameras, Image Sensors, GEO Services, and the soon to be released IP broadband Go!Bridge (which enables dual path communication for both cellular and internet connectivity).

Telular/Telguard:
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Alarm.com:
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So, in conclusion, if you are considering 2GIG, go with a provider that offers alarm.com's backend services (and which includes the *AirFX remote toolkit) It's more dependable, faster, and will provide an overall user experience that is light years beyond anything that Telguard can apparently at this time provide.

*AirFX lets technicians/providers program the panel, troubleshoot and resolve many issues remotely.