Adguard should be on Every mobile device.   Offers a wide choice of Encrypted DNS servers...your choice of multiple ad & tracker filters as well as a very good firewall to block wifi and data access for installed application.   The built in log file allows user to generate personal black list to block additional DNS requests such a cloudfront.net... 3g.com.. Yahoo.com... Ect.   Any unwanted DNS requests can be blocked and put into a private personal filter.   Well worth the price of premium version.  Completely able to block all of googles spy apps,  trackers and data brokers.