It's pretty much same as a PC. Normally it's unencrypted, unless the browser is showing HTTPS and/or the padlock icon, i.e. it's a secure website. If app data is encrypted or not, it depends on the app. The Google apps use encryption.
If in doubt, say like you're using open WiFi at Starbucks or whatever, suggest you use a secure VPN or proxy. Which is what I do all the time now, secure VPN.
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