Sim Card for Manila/Cambodia/Vietnam/Kuala Lumpur

I have a 10 day trip coming up primarily in Siem Reap/Hanoi but a day stopover in both Manila and KL. Any suggestions for a sim card? Due to being so many countries I am thinking it could be difficult to arrange one that covers all so maybe I should just try to cover Cambdodia/Vietnam? But even with a full day in KL it would be useful to have a sim card to use Grab.

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