I have seen several posts about how to connect a raspberry Pi to a 3g modem to begin transmitting data. Here is an example of a modem I would like to use.
My main confusion is in how you get the the 3g modem set up in the first place. Do you have to register the modem with a 3G carrier? Also, is it possible to set up one data plan with many 3g modems using the same plan? I want to have many raspberry Pi's set up doing pretty minimal network activity.