You can also minimize how much cellular data you use by connecting to Wi-Fi networks whenever they're available. But it can be a hassle to find and connect to unknown Wi-Fi networks on your Android phone, and it usually involves opening your Settings menu and trying unsecured networks one after another to see if they work.

Luckily, you can (sort of) circumvent this annoyance by using a free Wi-Fi finder app, such as WeFi Pro or WiFi Manager.

is a background app that automatically connects your Android device to the best available Wi-Fi network. WeFi has a couple of useful things about it: First, it's a "social" Wi-Fi finder, which means that whenever a WeFi user finds a strong, open Wi-Fi connection, that hotspot is logged in the WeFi database. Second, WeFi has the ability to turn on your Wi-Fi automatically (not always a good thing) if you're near a known good connection or if you do something that would benefit from an Internet connection (opening a webpage, for example). If you're willing to trust WeFi with control of your Wi-Fi radio, it's a great way to ensure that you're always taking advantage of Wi-Fi at home or at the office.

is a more typical Wi-Fi finder. It shows you a list of available connections, along with signal strength and status. It also has a radar mode, which shows you which channels nearby Wi-Fi networks are running on. This is useful for two things--determining if your Wi-Fi router is running on a congested channel (learn how to ), and determining which open network is likely to be the fastest, based on how many other routers are running on the same channel.