TOR Bundle Browser scores quiet well:

https://panopticlick.eff.org/

related:

Holy Cow: „O2 mobile users in the UK are venting on Twitter today, fuming at their discovery that their phone number is being shared with every website that they visit over the network.“

https://nakedsecurity.sophos.com/2012/01/25/smartphone-website-telephone-number/

you can test here if your phone is leaking your phone-number: https://www.mulliner.org/pc.cgi

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