The VoIP restriction is the most important thing on this page
The United Arab Emirates regulates voice-over-IP calling. In practice that means WhatsApp calls, FaceTime, and voice and video calling in several other messaging apps are commonly blocked or unreliable while you are connected in the UAE.
This is a national regulatory position, not a property of your plan, your phone or your provider. It applies whether you are on Etisalat, du, hotel Wi-Fi, or a travel eSIM. Any provider implying their eSIM restores WhatsApp calling in the UAE is overpromising.
What does work normally is data. Browsing, maps, email, rideshare, social media, and text messaging in WhatsApp and other apps all function as usual. It is specifically the voice and video calling features that are affected.
If you need to make calls from the UAE, plan around it before you travel. Licensed regional calling services exist, standard cellular calls on your home number will work subject to your own carrier's roaming charges, and business travellers frequently rely on corporate conferencing platforms, some of which remain accessible. Verify what you need against current conditions rather than assuming, since the specifics change.