In the 21st century anonymity it’s not about staying at home alone and no one will know what are you doing, it’s all about your privacy on the Internet.
1. Use app which called Signal
2. Use Tor (pretty easy to predict)
Tor is the most popular and most dominant browser in the world, which has really amazing resistance to metadata. Anyway, for some reason, Tor does not give you 100% anonymity as some people think, but still, it’s the best. The browser works only through TCP, and you can’t sign all the sites from Tor, because some sites blocks access. As it does not give 100% performance, it always has dual or trial use, such as VPN tunnels, but it is perfect for mobile.
3. Don’t wait anonymity from VPNs
4. Only use zero-knowledge services, if possible
Maybe you did not know, but all internet giants like Dropbox, Google, Office 365 can read everything you save and write, and they do that, we know that from Snowden reports, so they strongly cooperate with the FBI. Zero privacy with these services. You can encrypt everything before using these services but is easier to use zero-knowledge sites. Examples are SpiderOak(as Dropbox replacement) and Protonmail(private mails), this is no panacea, but much better.
5. Think first — post next
6. Always check app permissions
Usually, apps ask for really needed permissions, which are needed for the normal work of the app, but sometimes they use really strange things. They are always collecting information about you, to create big data collections — mostly for advertisers, but this FBI easily will get this information and any other skilled persons can get it too. It’s funny when a simple app (from the first look) asks for a microphone or your geolocation or your address book, better just do not to use these apps, it’s hard to stop all of these on IOS, so better use android.