Sure, WiFi access is just about everywhere. But many times, those WiFi hotspots are anything but private, so connecting your smartphone to them could reveal your information to any hackers that might be lurking. Install SSH Tunnel, though, and you'll be much more secure.
With SSH Tunnel, you'll be able to create an SSH (Secure Shell session) that builds a so-called tunnel as you send and receive data. Although your data itself isn't encrypted, the tunnel it passes through is. That means your e-mail login password is safe from mischievous eyes, and no one will be able to nab the credit card number you used for an online purchase, either.