guys do you know what number to sms to know to whom the number is registered to?

Last time i manage to get it where in the sms it will show the full name of the owner's number and length of stayed with hotlink.

downgrade to value rm50 and use rm10 supplementary line, stop using mobile internet. but still under use rite? can value first rm30 have a supp line? if yes then downgrade to value first lah.