Hi Tantalum,
NB-IoT and M1 networks are currently in testing phases around Europe. Certain cities will have coverage, but you will need a special contract to use any of those networks. Those contracts are only given to industry customers in most cases and require a lot of paperwork as well as minimum orders in the 100s to 1000s SIMs. You could try your luck and contact M2M / B2B sales of your local provider and ask for a free card or an evaluation pack.
Full rollout across will take time. Please also note that the current roaming contracts don't include M1 and NB-IoT as of now, so you won't be able to use the card in any other than your home network.
BR
Christopher