I know everybody is looking for a mobile phone manager for Linux. text based gammu is there, but it is not user friendly . wammu is a graphical front end for gammu.
Using wammu you can read/edit/delete/copy your contacts, todo, calendar you can read/create/save/send and backup your sms. some type of phone supports file sending, display message including pictures and ringtones playback. Support for backup and import in various formats (vCard, vCalendar, iCalendar, gammu own backup,...) . Export messages to mail (IMAP4, maildir and mailbox storages are supported). Searching for phone, translated into several languages, rated as best on many software servers
wammu is in development stage, It supports Sony Ericsson phones, Motorola Phones, some models of Nokia, Siemens, Alcatel.
Howto install wammu in ubuntu /debian
$ sudo apt-get install wammu (or use synaptic package manager )