phone application is not available in ipad pro and whatsapp call voice and video is not available

Do you have an iPhone, or just an iPad?

An iPad, whether a Cellular model or not, is not capable of directly accessing Cellular Voice or Messaging features. An iPad with Cellular connectivity alone can only access IP-data services. An iPad is not, and can never be, a standalone substitute for an iPhone.  If you have added a DataSIM and Cellular plan to a WiFi+Cellular model of iPad, the number associated with the SIM card is only used to identify your account for billing purposes. This number is not used for making calls or sending messages.

However, If paired with an iPhone, the capabilities of iPad significantly broaden to include access to Cellular Voice and Messaging services of the associated iPhone - relayed to the iPad over WiFi using Apple’s Continuity features.

Information about Continuity and the relevant Cellular services can be found here:

Continuity

Use Continuity to connect your Mac, iPhone, iPad, iPod touch and Apple Watch – Apple Support

SMS/MMS Messaging

How to forward SMS/MMS text messages from your iPhone to your iPad, iPod touch or Mac - Apple Support

WiFi Calling

Make a call with Wi-Fi Calling – Apple Support

Make and receive phone calls on iPad - Apple Support

As for WhatsApp, the WhatsApp developers have not released an App compatible with iPad - the available App currently being limited to iPhone. Whilst the App is not available for iPad - you should be able to access the service using a web browser:

https://web.whatsapp.com/

That is correct, there is not a phone app on the ipad and never has been.

Whatsapp has not released an iPad version of their app.