I try to initiate a call using an ATD>SIM<5>; AT command (I also tried ATD=SIM<5>;) but always get the same answer - ERROR. Could anybody tell me why? I tried hundreds of different combination e.g. ATD=SM<5>;, ATD>SM"5"; etc. but without any result. I'm using an Ericsson A1018 mobile phone with cable connection to my PC (RS232).