Default [Q] App to secure phone, while surfing on public WiFi

Hi All,
I hope i am within forum rules by asking this Q here in this thread.

I am using WiFi as a Guest with guest password qt my office. But dont want to open/show my ID / mac address or any
Detail to administrator.
Q1. Is there any APP which can keep me & my device detail invisible while i am surfing / downloading any file via browser or torrent?

Q2. Gmail etc sites are blocked in WiFi , is there any app which can helps to browse to these URL's.

Looking forward for positive response..



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rJ...