Siemens C25, S25, C35, M35, S35, A35, A36, A40, C45, S45, ME45, SL42, SL45, S6, S8, C10, S10, S11, C30, S30, S40

RX voltage must be limited to 3V (by stabilitron or by using 3 Volt MAX3232) when using cable for SMS-ing. Mobile phone will loose network signal during the data exchange without this.