Dudes & Duddas..I think this is standadized through out all telco la..check this out:

-Maxis- : http://www.hotlink.com.my/en/support/terms...conditions.html
-DiGi- : http://new.digi.com.my/Page/products/default/all_prepaid (Digi Best Prepaid)
-Celcom- : https://www.xpax.com.my/magicsim

I don think they can secretly change la.