If the people who made it know much about telecoms, then no, the will not work. When your mobile device connects to the Internet, the connection tunnels through

If the people who made it know much about telecoms, then no, the will not work. When your mobile device connects to the Internet, the connection tunnels through the mobile network to a gateway specified by the "APN" (access point name). This is usually set up automatically these days, but you can dig the setting out of your phone. That's for an Internet connection - however a company can pay for a "private APN". This is still a gateway, but they control what it connects to. This is often done for machine to machine connections, e.g. for utility smart meters - so a SIM for a gas meter will not be provisioned for the normal Internet APN, and if you were able to get that SIM out (difficult as they are not usually in card format) you would not be able to connect to the Internet. Typically the equipment company will negotiate a cheaper data price than for Internet access, since the data usage will be low and predictable. Now it could be that the people who built this tracking device are too small scale to negotiate a deal, or just don't know this, but my guess is that (a) the SIM is not in a physical format which can be removed and fitted in a different device; and (b) it is connected to a private APN which is not connected to the Internet. BTW, if you look up the Wikipedia article, bear in mind that it is a bit inaccurate - for instance it refers to an APN as being a gateway to the Internet, which is not always true. I'll correct it some time.