de_middle SG I should say there are pros and cons to it. Not sure though how it it concerning the approval part.i was wondering whether it has the same function like the caller non id which u can choose to allow & disallow by pressing some code...
richong 3216 SG Singtel must get consent from the mobile phone user to be tracked & he/she can refuse to give the consent - so in the end nobody is the wiser.