FoneWiki.org is great wiki for sharing user experiences with phones. You can find there information about phones which are usually not provided by manufacturers as various usage hints.
As I think this might be interesting for more Gammu users, I decided to add links in Gammu phone database, which will point to FoneWiki.org pages. Linking is done by phone name, so it does not have to be always working, but works at least for some phones :-).