There's a local provider which has a plan with absurdly low limits (something with about 100 Mb total, tens of SMS messages, etc.) + a low fixed price per month

There's a local provider which has a plan with absurdly low limits (something with about 100 Mb total, tens of SMS messages, etc.) + a low fixed price per month to match. Power outages are rare enough that this application doesn't need much of plan.