So I have seen cellular modules on the market I've never had one or really understood them so I have a few questions. I dont know much about wireless interfacing so i may sound like a newbie. If you could answer as many as you can please.
1) what should I be looking for if I just want to relay a bit of info over long distances every so often?
2) do you need a "network" like verizon or something to use them? (I'm gonna guess no)
3) how would an arduino communicate with one? Through spi, i2c, or what?
4) anything else I should know?