[denzil_correa]

Technically, you can but you a limited time window.

https://www.whatsapp.com/faq/general/26000016

This is a dark pattern. In fact, once you say "Agree" you only have 30 days to opt-out.

> After you agree to our updated Terms of Service and Privacy Policy, you will have an additional 30 days to make this choice by going to Settings > Account > Share my account info in the app.

I can't see such an option on my phone.

[imron]

> Technically, you can

Technically you can't

The Facebook family of companies will still receive and use this information for other purposes such as improving infrastructure and delivery systems, understanding how our services or theirs are used, securing systems, and fighting spam, abuse, or infringement activities.

[denzil_correa]

There are some places where your phone number will be used regardless of your choice - spam/abuse and there are some parts where it would not be used - targeted ads.

[mbesto]

I don't see it on my phone either (iPhone).