Q.:  I have an Ericsson with an internal modem which is not listed ? A.:  There are more public documents but these are not online. All DRS-11 data cable compatible (3 Volt) phones have an AT command set.   Ericsson DI 27 (only standard commands)   Ericsson SH888 compatible phones: CF888, I888   Ericsson T28   Ericsson R320   Ericsson R380 (not official) AT*ESYN=1 uses Symbian R5 EPOC.connect protocol   Ericsson T68 and newer models compatible: R520, T39   AT*ESOM=? is for a custom ringtone but there is much more.