PocketMatrix

It works! Yeah, you have to put on Numlock and hold both the Fn and Alt keys to type the numbers to make the character. Yay!
ä alt132
ö alt148
ü alt129
ß alt225
Ä alt0196
Ö alt0214
Ü alt0220
€ alt0128

There, that's all the ones I need.
a site to list all of them.[/list][/i][/list]

And what about if you have a desktop keyboard?

I thought that in germany they don't use that one anymore? I've heard that they usually just use a double S (ss) instead. That should solve the problem .