Verizon and Sprint also have similar devices, but I was told they have to be in a Window ([in]direct GPS required, so not in a wiring closet?), plugged into your LAN.
I have noticed recently that I have another dead-spot near work... a power-cycle, or quick-switch to Airplane-mode, and then back usually fixes it, but I had that issue all the time in that area with Nextel after Sprint merged (or was it absorbed?) with them at least a few time a week.
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