Using WhatsApp instead of SMS enabled numbers

I have a question, I used a Twilio integration to enable sending SMS messages on a sub account. Now a client of mine has asked whether she could use WhatsApp.

Belgian traditional SMS carriers are notoriously greedy and charge more than 10 cents per SMS so this is not a cost-effective solution. I am wondering if someone has also switched from SMS enabled numbers to WhatsApp?

If so, I have a couple of questions:

Do you need a Business WhatsApp account in order to use WhatsApp?
The only thing we cannot use it for (comparing it to a Twilio or LC SMS enabled number) is the Missed Call Text Back feature, right?

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