Dakkus wrote:I wonder how this requirement of a sim card goes relates with Finnish prepaid sim cards. They are not registered in any manner, but can be just bought anonymously by anyone. Apparently because of that the cards don't work outside Finland at all.
Wonder if a few million such cards could be sent to Germany

This is a quite strange thing I've found crossing the world.
For instance in Greece is like in Finland (and if I don't miss, in Estonia and Iceland as well, at least), in Jordan is like but you can buy prepaid SIMs without anything for just 1st recharge, from the 2nd you need to register it.
In Italy, Poland and many other countries, you need to register the sim from the beginning before using it.
In my opinion, as 90% of the GSM nets belongs to the same 3-4 providers (Vodafone, Orange, T-Mobile) or at least they are linked, they should not make you pay roaming on the nets of the same owner... but I'm sure a day we'll be there!!! (as EU policy is mobile roaming costs reduction...).