Interface Arduino with Nokia phone

Hello, i'm getting crazy trying to interface a Nokia 6630 with Arduino, this is the story:

1)i bought a DKU5 cable and i hacked it to find the TX, the RX and the GND cable ;);

2)i connected the cables to Arduino including GND. Thanks to NewSoftSerial i created a fake serial port in pin 3 and 4 (digital);

3)i wrote the program using the library SSerial2mobile, typing 19200 as Baud Rate (read in the Nokia website) and using AT commands for Nokia phones: i want to send sms, so i specified the phone number and typed the text;

4)when the program started, the phone died, so i reduced the voltage of TX and RX from 5V to 2.8V with a voltage partitor using 2 resistors 8-);

5)now the phone doesn't die and it shows the little icon of headphones connected when the program starts, but it doesn't do anything.. :-/....

I don't know what to do now, help!!!! Any idea?? :-[

Without using SSerial2mobile i also tried with this code:

#include <NewSoftSerial.h>
#include <String.h>

char incoming_char=0;
NewSoftSerial tel(3,4);
int timesToSend = 1;
int count = 0;

void setup(){

void loop(){
   while (count < timesToSend){

But it doesn’t do anything…