All, I saw one post about the Telular devices. These are great devices, we have 3 of them on our Mobile Command Post. Depending on the carrier, and device, they are capable of acting as a modem as well as phone. I just did a quick Ebay search for "Cellular Terminal" and also "Telular" and found a bunch of them out there from various manufacturers, new and used. Getting a sim card if needed or otherwise activating will likely not be done at the local reseller / mall kiosk. Your best bet is to talk to a commercial or gov't accounts rep with the carrier of your choice. In our case I called our Verizon gov't account rep with the ESN of the devices and selected the plan of choice. We were set up within hours and talking. (no sim card needed on Verizon) A couple police depts. Have installed them as a backup line on their PBX in case of backhoe fade.
Bill N9SII