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Tobias Engel t-osmocombb at tobias.orgHi Marc, if you mean GSM/UMTS SMS when sent from a phone (MO, mobile originated), the answer is no. There is not even a field for the sender number in MO SMS, as it gets inserted by the SMSC. If you send SMS via an SMS provider who has a direct link to some operators SMSC, you can set the sender field to any value, including an empty field. As for silent SMS, they can be sent from most phones / UMTS sticks with AT commands by setting the TP-PID value to 64. Some operators however reset that value to 0 so the message arrives as a normal SMS at its destination - you have to try in advance. For the actual coding of the TP-PDU take a look at 3GPP 23.040 and for the AT commands for sending SMS 3GPP 27.005. -Tobias On 28.12.2011 21:16, MArc Richter wrote: > Hey! > > So is it possibel to to hide the sender extension with SMS ? > > regards > Marc > >