Hello  @SantiagoARG81 

Thank you for reach out to us.

1.  Tapo APP allows to login admin account (TP-Link ID/ email address that used to set up smart device) on multiple phones ,if a second mobile device needs the full permissions of camera, like Talk/ Voice Call etc, you could try to log in admin account using same email address and password on that second device. Hope this helps!

2. Shared account could only access live view and playback so far, here is a related  FAQ:How to share your Tapo smart devices (smart plug, smart camera, smart lighting) with your families

Hope this help.