Remote IOT microcontrollers with sim card ?

Say I need to deploy IOT systems in remote areas.... ( as in far from the cities )
would be best to use microcontrollers that works effortlessly with sim cards ? ( for connection )

If that's the case, which boards would you recommend. ? ( arduino and others )

Will those areas have cellular coverage?

Only if the intended areas have cellular coverage.

If they do have coverage, what type is it: 4G? 5G? NB-IoT? Cat-M? Other??

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it is worth considering lora which is designed for long distance communication ? see lora gateway map
you may need to visit the potential sites to check coverage, e.g. cellular, lora, etc
if no coverage is there a possible site for a Lora gateway?

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