I'm trying to connect to the NB-IoT network in my city, and I've already gotten the hardware as well as the confirmation that there is an NB-IoT cell tower in my neighborhood.
Naturally, there's an NB-IoT SIM card as well that is used to connect to the network, but I have not received that unfortunately.
Question: Is it somehow possible to connect to that guardband network which piggybacks (CMIIW) of the LTE network by using a 4G/LTE SIM card though? Since if I recall correctly, the base station only has its firmware renewed so that the NB-IoT radiowave can be recognized.
Additional question: There's SIM 800 and SIM900 shield for GSM modules. Can I theoretically use a 4G/LTE SIM card and utilize the 2G Network? I'm not quite sure I can just ask the kiosk owner next to my house the question "Hey is this data only 4G card 2G compatible?" cause I'm also not quite sure what that means.
So, if I were to use the 3G 4G module, like this one for example...the communications type is LTE, but the transmission type is GPRS and EDGE (and HSP+ as well as LTE), according to the data sheet. AFAIK, that transmission is the architecture of the network as it travels from the base station towards the internet (CMIIW), but would our type SIM card be relevant for that?
One more question I've never used a module with an embedded SIM before. How does that work? Am I subscribing to an ISP until a certain time? I'm rather new with cellular modules for microcontrollers, I only understand the connection service like how our mobile phones work.