WPA key with ASCII extended chars

Hi,
first of all, sorry my english.
I want to connect to a WPA wifi connection with my iPhone 4 but is impossible. My WPA key include ASCII extended chars as "¿","ñ" or "á" to give more security to my network and my iPhone says all the time "Impossible to join". I can connect with all my computers and other mobile phones.
If I remove all this characters, I can connect without problems with my iPhone.
It is a bug or a limitation from iOS? Is possible make a request to Apple to fix this?
Thanks!

you really should be only using the "printable ascii character set" of 95 (96?) characters. does extended mean the entire ascii character set of 0-255?
by any chance do you have an airport extreme? Or a Time Capsule?
if yes, you can load airport utility and use the WPA Pre-Shared key as an alternative to typing in the password with extended characters. ive done that with my kindle. it gives you the hexadecimal equivalent hash of your ssid and your password. you run airport utility, select base station and click on "Equivalent network password"
have you tried sending the password to the iphone with SMS or an email and using copy and pasting it in settings?
ive done that, but ive noticed that sometimes notes puts in an extra linefeed that doesn't work. iirc the messaging program put in a extra linefeed in the middle of my password and i had to copy it from messaging to notes to delete the linefeed and then paste it into settings
i wonder if iphone configuration utility can be used, i haven't tried that one yet
other routers might reveal the hexadecimal equivalent password

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