You can use the eSIM phone number to register booking accounts in Vietnam like Shopee,... or use VoIP apps like WhatsApp, Zalo, and Skype,... (About Grab, we can't guarantee eSIM can register especially with Giga7-10-15-120 plans).
Notes: When registering for an account in Vietnam, some apps will require you to enter the right form of phone number. If you get fail to register, you can try to add +84 and remove 0 in the first letter of your eSIM phone number. Check out the screenshot of Grab Register below:
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