Seguire passo per passo. Follow step by step Aprire il connettore con un taglierino cercando di non danneggiare i fili Open the Kable socket with a cutter and pay attention to NOT damage or cut  wires
Usare una batteria da 4,5 v o meglio 3 batterie da 1,5 stilo AA o AAA in serie con la giusta polarità. Saldare ai due estremi i fili. (Verde Positivo e NERO negativo della figura) Use a 4,5 Volts battery, or better using using 3 x 1,5 Volts battery AA type  in series (- + .. -  + ... -  + ) Put two wires at the end of the series. (Green for positive and Black for negative in the picture)
WARNING Il cavo originale Siemens non consente di accedere al PIN  e di attivare l'ignition che si ottiene premendo il tasto di accensione rosso. Usando la batteria si simula tale azione. C55 e M50 hanno differenti PINS. ATTENZIONE The Originale datakable CAN'T manage the "ignition" pin so with a external battiery is possible to "simulate" the RED button softly push using voltage of batteries. C55 and M50 have different PINS . BE CAREFUL! ------------------------------------------------------------------------------------------------------ PER C55 (Non valido per M50 e altri modelli inferiori X35...) A questo punto, quando la procedura indica di premere leggermente il tasto ROSSO in alternativa basta inserire per un attimo il filo POSITIVO (Filo verde della figura) nel PIN 1 e quello NEGATIVO nel PIN2  (filo nero) FOR C55 (not valid for M50 and other model as X35,etc..) In fact, when procedure ask to press red button softly for ignition, you have to put POSITIVE (Green wire) into PIN 1 and NEGATIVE (black wire) in PIN2 Per C55 POSITIVo Filo verde = PIN 1 NEGATIVO Filo NERO = PIN 2 For C55 The PINS are: POSITIVE GReen Wire = PIN 1 NEGATIVE Black Wire = PIN 2 Per M50 and X35 e altre precedenti serie Per l'M50 i pins sono diversi dal C55 POSITIVo Filo verde = PIN 4 NEGATIVO Filo NERO = PIN 1 For M50 and older series as X35 The PINS are: POSITIVE GReen Wire = PIN 4 NEGATIVE Black Wire = PIN 1 ERRORE il PIN POSITIVO E' il 4 e non il 3 MY MISTAKE POSITIVE PIN IS 4 and NOT 3	Esempio posizionamento fili per per C55 Example for C55 wires
For original Procedure in GERMAN ask me link. THANKS 1000 !! to LastActionHero (German)	.

HOW to get a datakable in Italy ??? Dove trovare un cavetto in Internet ?
- Gratis sul sito www.pitstopsiemens.it L'unico problema è che è originale, e quindi niente procedura Early Bird. 
Per cavi non originali:
www.zetabyte.com   
http://www.alientech.it/zetabyte/zetabyte.htm 
http://www.cavigsm.com/ 
http://www.phonia.it 

C55 cable

In order to activate java and to read and to transfer data to the telephone we needed a cable, but it is not worth any cable, has to be a cable nonoriginal Siemens. A very common error is to buy the original cable of the Siemens mark and soon to verify with horror that does not serve to make the things that we wanted more. The Siemens C55 has a narrower connector, reason why the cable that we could use in the Siemens X25, X35, X45, X50, etc does not serve to us, we needed one new specific one for the C55. Basically are two options with respect to the cable of the C55, or to buy one specifically for him (very difficult to still find in Spain) or to modify the cable of the old models and to adapt it to the connector of the C55.

1ª Option: to buy the cable by Internet.
SEE FAQ

 2ª Option: to modify the old cable (type X35- M50)
Necessary materials: the old cable, a tin soldering iron and one files. In order to obtain our intention first we will have to file the connector of the cable until it is left the sufficiently thin thing like so that it fits in the hollow of the connector of the C55. Next we will have to disassemble to the cable by the part of the connector and behavior to interchange its pins using the tin soldering iron as much to desoldar as to return to weld. Here down I let the scheme to know to you how to interchange them:

M50 CABLE and Scheme

This is a Siemens generic Pinout up to M50 model

Electrical scheme for M50 Data Cable

Another electrical Scheme for M50 Data cable