i just did changes on my plan 2 weeks back.
i convert from maxis to prepaid through phone.
after that, just switch to postpaid.

however, since the # is register under your mother name, you would hv to get a gal to help.
"just pretend to be your mother" and when they asking verification, just provide them the data.
after that you will be able to convert to hotlink prepaid without need to change the sim card.
then subscribe to RM35 plan for 1 month, then convert to postpaid.
not sure if converting from prepaid to post can done through phone call or online. But, i think it is possible to done through phone call if owner remain same since they already hv your mum data.

This post has been edited by stevenlee: Aug 10 2022, 11:47 AM