Originally Posted by ScottC

Not entirely true. There are plenty of phones in Germany and the rest of Europe that use the same RJ-11 connectors as in the US, but most public locations (like a hotel) still often use the dedicated phone jacks issued by the phone company.

But by far the biggest issue with hotel phones isn't the jack, it's the fact that they are PBX phones that won't work on a regular device (like Magicjack).