yes, you can.

Yes for groceries I supposed. Even some Giant allows TnG reloads using gift card.

1) Want to ask if i go Maxis Center KLCC buy phone + subscribe a plan using Wise Card is it fall under Mobile Category?

2) Maxis Online Store consider under Mobile Category?

3) Can use Wise Card buy phone with easy 12 monthly installment under Maxis and fall under mobile cash back category?

4) Lastly just want to know any tricks to get Wise Card cashback if buy Phone from Maxis?

at least 21 days before effective, must be announced.

hope it only affects NEW cardholders, instead of blanketing all 
3 possibilities of revision:

1) rm100 max cap revised down. if so, they better remove the 10xRM50 requirements. maybe unlikely cuz they also wants us to spend more.

2) 10% cb rate revised down. very likely cuz by reducing the cb rate (if #1 maintained capped at rm100) means users are gonna spend even more to reach max rm100.

3) reduce categories. maybe unlikely since other cards already revised to selective categories. Wise's essentially applies to certain categories, not everything/unlimited.

2sen