As a resident in Denmark, this is awesome news. It really sucks that you've got so many internet connected things, but after 300km MAX, you are on the other side of the border, and you are reduced to feature phone-like capabilities (Thanks Nokia/HERE for offline maps).
To people from US; Imagine living on the east coast (with the smaller states) and every time you move outside of your state, you had to use a feature phone.
We don't have to imagine it -- that is how it is in the US.
For example, if you are on T-Mobile USA, living on the east coast, anytime you drive west, after about 100km your "4G" smartphone is reduced to a feature phone (either on T-Mobile's own GRPS/EDGE-only network, or hyper-restricted voice/sms-only roaming on AT&T).
This happens even if the other operators have extensive 3G/4G/LTE networks available in those cities.
This has a lot to do with T-Mobile being a weak network. Even in the middle of nowhere on the interstate in West Virginia, I had 3G data with Verizon. Granted that if I moved further from the interstate, there would have been nothing, but the interstate is usually where you are when you're away from population centers.
The budget carriers which resell existing networks (TracFone, Virgin, SimpleMobile, etc) have no roaming at all, so when you leave the coverage area of the resold network you just don't have a working phone. Legally 911 will work, but nothing else.
The USA is HUGE. It's not cost effective to put data where every inch of land is covered, ever slow data (EDGE). There's a ton of sparsely populated land, and rural areas. T-Mobile is a small operator and has the crappiest network coverage. It is 1000x better than it was 4 years ago, as they are adding more coverage, but it is expensive and slow. T-mobile is the worst for data coverage, and voice coverage. I had them for years, and I eventually dropped them for Verizon because I was finding myself without any cellphone service so often, because I travel often, and I find myself in rural areas. If I stayed in the city all the time it would work for me. That means no voice, no SMS, no data.
Take a look at T-Mobile's 3G and 4G coverage map (and voice):
The other big issue is we have two standards here. GSM and CDMA. GSM is what T-Mobile and AT&T use, and CDMA is what Verizon and Sprint use. These can't play nice-nice with each other. Plus AT&T's 3G was different from T-Mobile's 3G so a AT&T 3G phone couldn't work with T-Moble's 3G signal and vice-visa.
With 4G LTE, I believe this is a standard that both GSM and CDMA are "upgrading" to. I know that my CDMA phone needed a SIM card to work with the 4G LTE network (CDMA cards previously didn't require SIM cards).
To people from US; Imagine living on the east coast (with the smaller states) and every time you move outside of your state, you had to use a feature phone.