The RM number is the Hartware version as well with other manufacturers, there are various hard goods with almost every mobile phone in the course of time to reduce costs to the production, there are also phones that have the same RM number so have the same hard goods for example Sony syberschot K sony K 800i 810i have one already so personally changed the housing and umgefl?ht as the 810i looked much better you'll only across areas that supported the hard-ware also worked with my Xpress Music Nuron and made out of it: wink: