The scammer cannot access your phone unless they sent you a picture with a virus in it, which is extemely rare. Videos cannot be infected, nor live chats. Even though you used only fake names, we always suggest that you follow all of the advice steps to make sure they cannot find you. And also
most important is to fill out the online form with as many scammer details as you have to help protect others from the scammer.
Please go here, fill out the form, and follow all of the advice to protect yourself and other victims of the scammer. Please post as many details on the scammer as you have in the form.
http://www.scamsurvivors.com/blackmail/#/