[f300]

I am both sorry for United Mobile and mildly annoyed. I understand they are probably caught between a rock and a hard place and they can't possibly make a viable business with free incoming.
But this goes both ways. One of the great features of United Mobile/Riiing was that you were called for free in so many countries. For this we were willing to put up with unreliable network, different (and expensive) phone number and poor support resembling an "apartment company" not a phone operator.
But now for EU where a big chunk of the "roaming market" is (because countries are small and so easy to cross borders) because of regulations most prices are capped now by law (and will be even lower in the future). So even if you take the most inefficient "local" SIM and use it in roaming in EU you can still get some calls out of a 15 EUR recharge.
For more exotic places people adapt. You have your "normal" mobile with you but use it only for emergencies because it's expensive (but that's no surprise, it has been like this for as long there was roaming and there was a time when there was NO roaming at any price). The rest you can easily take care over skype and such.
Even if disappointing there's no big tragedy that UM went this way. In the end maybe I'll even feel better, I'll take my UM+ number out from my business card (it was anyway confusing people and the SIM was off most of the time), I'll take the SIM out of my wallet and not have to decide which one to use (or whether I should carry two phones) when I travel. Good riddance.