Recently I stumbled about this great article about ASCII, 7 and 8 Bit, codepages, Multi byte, Wide byte and unicode: http://www.joelonsoftware.com/articles/Unicode.html
If you ever get in trouble with wrong encoding display of chars, give this article a try to know the backgrounds.
As you know, Windows CE and Windows Mobile is always unicode except for serial and socket communication. But the truetype fonts available on Windows Mobile devices mostly support only common chars, there file size is about 600K. The file size of Arial Unicode MS is about 22MB.