The Nokia e90 should indeed be able to run the chess.com mobile app. Maybe you can try to get it from the download section of this web site and then manually put it on your mobile through your PC ( if you can do that ).
nokia e90
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Sorry, i would like to know why my nokia e90 doesn't permet me to download the file why it says to me that it is a non valid file, perhaps the extension, how can i do ?
Thank you
Luca