Right yeah it is where you use each nibble of the octet to represent a single digit, obviously you then have a - f to represent other things.
In that case are you sure that 2a does not represent in fact represent 2* rather than *2.
Yes,in manual method, I use a few numbers which are *2,00*2 or +*2 to send an sms.
Do you think there's other thing that I need to look into in order to make my testing works?