> Don't know about Ukko or what they cover, can't even figure out if they are an MVNO or not their wikipedia entry says that they operate LTE 31 which makes them sound like a rural/remote region operator since that's what most of these low bands are used for.
Ukko is an MNO, not an MVNO. They hold a national license for the 450 MHz band which they use to provide data services in all of Finland.
> If they indeed operate on the LTE 31 band this also means they are a speciality carrier which also means they have to provide you with their own devices since I'm not aware of any mass market consumer device which supports B31
Correct.
> The cellular spectrum especially in regards to 4G LTE channels is pretty damn large, and most countries started with more than 3-4 cellular providers they just had decades of consolidation since then.
Ukko is an MNO, not an MVNO. They hold a national license for the 450 MHz band which they use to provide data services in all of Finland.
Here is their coverage map: http://www.ukkoverkot.fi/kuuluvuus/
> If they indeed operate on the LTE 31 band this also means they are a speciality carrier which also means they have to provide you with their own devices since I'm not aware of any mass market consumer device which supports B31
Correct.
> The cellular spectrum especially in regards to 4G LTE channels is pretty damn large, and most countries started with more than 3-4 cellular providers they just had decades of consolidation since then.
Not all LTE bands are available in all countries.