A while back nokia released the n-gage phone. It even had shelf space for games at the local EB store. I don't think it caught on though and I don't see the stuff around anymore. If it was a failed experiment I can't see companies like nokia jumping on the bandwagon too quickly again.
I see the n-gage site is still up but I can't recall seeing much in the way of promotion for it and sites like IGN have taken down their section for it that included reviews etc..