Currently, the availability of ad blockers is limited on smartphones, which are used by many people for web browsing. In some regions, web browsing may be restricted without using a VPN. In such cases, smartphones cannot be used in combination with a VPN and a standalone ad blocker such as AdGuard. As a result, some people may give up using ad blockers. DNS-based ad blockers can achieve some of the same goals, but they are less effective than standalone ad blockers and are more likely to be detected by anti-ad blockers.