Talk:United Kingdom/@comment-91.158.123.165-20190715070854/@comment-24682153-20190715161709

There is no contractual obligation to offer 4G/LTE while roaming abroad. Three was the last of the UK providers to adopt 4G roaming even if they have a very advanced roaming scheme.

Three officially doesn't publish a list of 4G roaming destinations. They only offer a map for each Go Roam country and in some of them a 4G layer is shown, in others it's not. That's where this list comes from. There may be countries like Finland where a 4G layer is shown for DNA coverage, but in fact roaming is still restricted to 3G.

There is also the opposite case when Three has 2 roaming partners like in Germany. With both Telekom and Telefónica (o2) Three now roams in 4G, but only the coverage of Telefonica is shown. The even better coverage of Telekom isn't. I guess they are not able or allowed to blend two maps.

For a reliable 4G roaming coverage use a local SIM card or (if you prefer a UK SIM) use a different UK provider in Finland.