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Jan 26, 2018 at 17:26 comment added waltonob @loneboat The most common security recommendation for untrusted wifi is to use a VPN like you've asked. The common security threats in such situations are rouge access points acting like the unsecured network and packet sniffing (see cnet.com/how-to/tips-to-stay-safe-on-public-wi-fi for some tips). Also, I did a port scan on my Galaxy S8 and found 3 open ports mostly from installed apps. Three open ports is a relatively small attack surface but my phone isn't as invisible as my laptop with a firewall that blocks all inbound connections.
Jan 26, 2018 at 16:36 comment added loneboat Thanks, that makes sense. Marking this as answered. As a follow-up question (which probably doesn't justify a separate post) - how risky is it to connect to untrusted wifi networks assuming I'm up-to-date in my security patches in Android (Google Pixel which get's updates directly from Google)? Barring some zero-day vulnerability, aren't modern phones relatively hardened against random open ports?
Jan 26, 2018 at 16:25 vote accept loneboat
Jan 25, 2018 at 23:06 history edited waltonob CC BY-SA 3.0
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Jan 25, 2018 at 23:01 history answered waltonob CC BY-SA 3.0