Open Blocked websites

NO VPN installation required (tutorial for iPhone)

On your iPhone : Go to settings and to Wi-fi.  Then click on the "i" icon next to your connected Wi-fi.

Then tap on Configure DNS 

Change Automatic to Manual and delete any DNS Servers there.

Use the Google Public  DNS either  8.8.8.8 / 8.8.4.4  OR  1.1.1.1 / 1.0.0.1 [Save - and all blocked sites will be accessible]

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