its works like this...

after registration , u will obtain a password..

then when ur prepaid no money, and want top up..

use the post paid type

topup 0123456789 100

send to 22126

then a sms will be send to u asking for the password to confirm.

then reply with ur xxxxxx

and TAA DAA..its done..a confirmation sms will be received BUT hotlink will not get any notice.