How much data does WhatsApp use?
A WhatsApp voice call costs about 0.5 MB a minute and a video call 5 to 15 MB. Texting rounds to nothing. Auto-downloaded media is what empties a plan.
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Can I use WhatsApp with a travel eSIM?
Yes, and your number does not change. WhatsApp is tied to the number you registered, not to the SIM supplying data. What to set up before you fly.