[mothered]

As long as you're connected via your ISP, you will never be completely anonymous.

Anonymity as a whole, takes a lot more doing than simply connecting to a VPN, proxy etc. There's "a lot" to consider and put In practice, hence Is way beyond the scope of this post to provide every method & tool.

Just to name a few Inclusive from a cell phone perspective, there's DNS leaks, WebRTC, Browser & Canvas fingerprinting, User Agent leaks, Cross-Browser fingerprinting on an OS & hardware level, Ultrasonic Cross-Device tracking, WebGL fingerprinting, Connection, Hardware, Login, DNS "Cache" leaks, cell phone sensor vulnerabilities (Proximity, Magnetometer, Gyroscope, Acceleromete, GPS, Barometer, Biometric, Ambient Light sensors) and the list goes on.

All can reveal an array of Identifiable Information, both on a device and personal level.