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To successfully unblock Thumbzilla on a portable device, the user must identify whether the block is network-based (requiring a VPN/DNS change) or browser-based (requiring a setting toggle). The most effective "solid" solution is the combination of a to bypass network filters and a privacy-focused browser (like Brave) to mitigate security risks and bypass browser-level warnings.
A VPN is the most reliable method. It creates an encrypted "tunnel" for your internet traffic. Because the network filter cannot see what data is inside the tunnel or which site you are visiting, it cannot block it.