Q.:  My phone supports calendar, custom ringtones, logos etc … A.:  Many use extended AT command sets for internal test and their own sync software, not documented very well. Michal Čihař provides similar pages. Some use OBEX … Company  Namespace  Notes  Alcatel Mobile AT+… platform died in 2006: last device Benefon AT*Be… registration was required; alive ever? Ericsson … AT*E… platform died in 2010: last device HP webOS … AT+PALM… Mitsubishi (Trium) AT~M… platform died in 2002: last device Motorola AT+M… platform died in 2006: last device limited official docs (calendar) Nokia … AT*Nokia… own, non-public protocol Option Wireless AT_O… documentation behind an IMEI check Panasonic (PMC) AT+C… platform died in 2006: last device Sagem Wireless AT+K… Samsung Electronics AT+… various platforms, various protocols Siemens / Bosch …  AT^S… platform died in 2006: last device Sony … AT-S… platform died in 2002: last device Wavecom AT+W… documentation behind an IMEI check Q.:  If your phone or company is not listed you have to scan …