Wammu is a mobile phone manager that uses Gammu as its backend. It works with any phone that Gammu supports, including many models from Nokia, Siemens, and Alcatel. It has complete support (read, edit, delete, copy) for contacts, todo, and calendar. It can read, save, and send SMS.
Wammu includes an SMS composer for multi-part SMS messages, and it can display SMS messages that include pictures. Currently, only text and predefined bitmaps or sounds can be edited in the SMS composer. It can export messages to an IMAP4 server (or other email storage).
Wammu is mobile phone manager running on Linux, Windows and possibly other platforms, where Gammu and wxPython works. The communication is made by Gammu library. Currently supported features:

complete support (can read/edit/delete/copy) for contacts, todo, calendar
can read/create/save/send/backup smses
sending files to phone (OBEX and Sony Ericsson phones only)
sms composer for multi part smses (currently only text and predefined bitmap/sound can be edited)
display message including pictures and ringtones playback
support for backup and import in various formats (vCard, vCalendar, vTodo, 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

Phones supported by Gammu:
Nokia DCT3 (3210, 3310, 3330, 3390, 3410, 5110, 5110i, 5130, 5190, 5210, 5510, 6110, 6130, 6150, 6190, 8210, 8250, 8290, 8850, 8855, 8890 6210, 6250, 7110, 9110) and compatible
Nokia DCT4 (3510, 3510i, 3530, 5100, 6100, 6310, 6310i, 6510, 6610, 7210, 8310, 8910) and compatible
Siemens M20, MC35, SL45 and compatible
Alcatel One Touch 501, 701, 715, 535, 735
Sony Ericsson phones
Motorola phones
AT compatible phones
Symbian phones up to Symbian 9.0 are supported through gnapplet

The license of this software is Freeware, you can free download and free use this wireless communication software.