Not too long ago I mentioned about Mobango, website dedicated to members that like to share cell phone files. Mbuzzy is the same way but they offer chat and videos.

Some differences I found out about those two sites:

Mobango is more dedicated to only cellphone stuff, has more files to offer and the only way members can communicate is via private message.

Mbuzzy is a bit different from mobango, they are more dedicated to members but less to cell phones. They offer videos, chat,  sms, pictures and only ringtones. There ringtones are free.