Q.:  My phone supports calendar, custom ringtones, logos etc… A.:  Most companies have an extended AT command set. Unfortunately not all are public but some can be downloaded free of charge. Company  Namespace  Notes  Alcatel AT+… registration required Benefon AT*Be… registration required Ericsson… AT*E… registration required Mitsubishi (Trium) AT~M… no official documentation Motorola AT+M… limited official docs (calendar) Nokia… AT*Nokia… AT*N… no real extended command set Option Wireless AT_O… documentation behind an IMEI check Panasonic AT+C… no official documentation Sagem AT+K… no official documentation Samsung AT+… no official documentation Siemens / Bosch…  AT^S… registration required Sony… AT-S… no official documentation Wavecom AT+W… AT+S… documentation behind an IMEI check Q.:  If your phone or company is not listed you have to scan…