i was curious to why they decided to package some text in an .exe file.. or so called ebook, anyway i ran it on a virtual machine and for those that don't want to run an .exe.. this is how the trick suppose to work.. quoted.
"Step 1: Buy a Top Up voucher or PayPoint/PayZone printout of your
choice, find a friend or family member who is also on the same network to buy one too.
Step 2: Both of you type in the digits on the Top Up voucher or printout into your own phone (the same voucher). You need to enter the same digits into both phones at the same time.
Step 3: When you get to the last digit both of you press confirm at the exact same time so the same voucher registers on both of your phones.
Step 4: Repeat this with the other card. You will now have twice the
amount of credit on your phone for the price of half.
This works around about 99% of the time. Take care to enter the last digit and the confirm key at the same time.