[Motel75]

To the extent that such things exist, it might be a good idea to list the mobile prefixes in each country that are hard to get nowadays, or are in some way prestigious.

In some cases, these would be the earliest mobile prefixes in a country, such as 0172 in Germany, the original Mannesmann/Vodafone prefix, which is quite rare nowadays.

It might also be due to a shorter number, such as the older German prefixes with 7-digit phone numbers, where some later prefixes have 8 digits.

In other cases, these prefixes might be an interesting or lucky combination of numbers, like 888 in Poland.

And it might be tied to a location, such as 212 (Manhattan) in the U.S.

Alternatively, it could be a prefix belonging to a company that was only briefly on the market (such as 0150 for Quam in Germany).

(Although this thread is on the Europe board, if there are any prefixes like this elsewhere, please add them.)