I would think the Free Trial works the same as the paid trial.
Honestly I don't use Dalphin-Anty, I use Ads Power because I am able to run multiple WhatsApp accounts on it.
https://share.adspower.net/FreeTrial
Let me know if you need any help. I run tens iof thousands of social accounts on Multi-Browsers and if you need any numbers to SMS verify your accounts I am here to help.