What carrier are you using for GSM coverage in the XT2000?

Our carrier depends on the specific SIM/Rate plan that is used.  We use both Numerex branded SIMs (our own network) and ATT branded SIMs.  Generally we use the Numerex branded SIMS.  Numerex is what is known as a Mobile Network Operator (MNO), meaning that we have our own billing, provisioning and other facilities.  We then have preferred roaming agreements on about 22 Tier I, Tier II and Tier III carriers - to provide an extensive national footprint.  So the actual Tower will depend where the SIM is located and who has the best coverage in a particular spot.

The Numerex network has roaming privileges on multiple GSM carriers

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