Want to know if we can add our own number to talk while using zendesk on trial?

Hi @ayesha11 welcome to our Community! 

You can use your own number by porting it to Zendesk, however, you must be subscribed to a paid Talk plan as we are unable to port phone numbers while you are on trial. 

You may find more info here: Porting numbers for Zendesk Talk

I hope this helps!

Thanks @audrey