Unlike in the US, unlimited calls and unlimited sms is not a thing in many countries where WhatsApp is popular. In contrast, WhatsApp calls and messages are free. This was quite significant, especially early on when WhatsApp starting to get popular during the J2ME / Symbian era.
Now that everyone use it, if you don’t use it you’ll be that one weirdo who don’t use WhatsApp and people may choose to not contact you at all (especially if it’ll cost money to call you). Even businesses and banks have WhatsApp account these days, so not using WhatsApp will inconvenience you if you live where WhatsApp is dominant.
Two things really:
Unlike in the US, unlimited calls and unlimited sms is not a thing in many countries where WhatsApp is popular. In contrast, WhatsApp calls and messages are free. This was quite significant, especially early on when WhatsApp starting to get popular during the J2ME / Symbian era.
Now that everyone use it, if you don’t use it you’ll be that one weirdo who don’t use WhatsApp and people may choose to not contact you at all (especially if it’ll cost money to call you). Even businesses and banks have WhatsApp account these days, so not using WhatsApp will inconvenience you if you live where WhatsApp is dominant.