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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.
 Ericsson Nokia Siemens Sony webOS @