"How To Send Free SMS Messages From An x2 Payphone"

Okay guys, now for the exploit. We all remember the old straw trick to make free phonecalls? Well the phone company patched it up so it detects if that trick is being used. However, the patch doesnt check when using the SMS feature on the newer X2 phone.

The X2 coinbox works on a weighting system, where the coins are weighed and the weight is compared to the "apparent" credit that is clocked on the display. The patch, makes the phone check the weight as the call connects, so if their is a descrepancy, the call will drop out.

The SMS system on the X2 works slightly differently, first sending the message to the MTMS/Call Centre, and then deposits the money. The straw trick works in this case as the service has completed by the time the deposit takes place, so the message is sent before the phone checks the money. Exploit Method (this will require some knowledge of the straw trick):

1. Insert amount of coins into phone(usually SMS cost on X2 is 20c)

2. Using the straw trick, drop the money out.

3. Hit the button for SMS.

4. Type your message and send.

5. The phone will make someweird noises, and possibly call MTMS, after the message is sent, the phone will work correctly in approx. 2minutes.

Straw Trick (for those that dont know

1. Insert a straw, length ways, into the payphone,in the gap between the top of the coin return and coin return flap.

2. Approx. 2/3 of the way from the left, approx. 10cm's back is a little tab which you hit with the straw. This will return any money in the payphone.

3. Repeat step 1 and 2 until appropriate total is reached.