so

[none]

which pins do i connecto to the RS232 interface?

GND to GND,
RX to TX
TX to RX


???


and that's it??

[Andrew]

which pins do i connecto to the RS232 interface?

GND to GND,
RX to TX
TX to RX
and that's it??

Your are asking about cell phone, isn't it?
In this case I must answer no, since most cellphones uses signals levels, incompatible with computer serial port.
So, in most cases, special convertor needed, like this http://pinouts.ru/data/cell_cable_pinout.shtml