It is impossible to use someone's WiFi network without their password. However, there are a number of applications that allow you to crack the WiFi network's password so you can use the network even if you don't know it. Here's a list of some of the most popular pieces of WiFi network hacking software available.
Staying safe on public Wi-Fi. Free public Wi-Fi is incredibly convenient, but security can be an issue. Here's how to minimize the risk, whether you use a laptop, smartphone, or tablet. Secure WiFi - Apps on Google Play Sprint Secure Wi-Fi automatically encrypts your data when you connect to an unsecure Wi-Fi network. As soon as an unsecure Wi-Fi network is detected, Secure Wi-Fi enables a VPN connection to make sure no one can steal your passwords, hijack your login, or monitor your activity. Once the phone disconnects from the unsecure Wi-Fi network, the VPN connection automatically turns off. CUIT Wireless Network | Columbia University Information
Top 10 Wireless Home Network Security Tips
How to connect to any WiFi without Password Trick (May
Keep Your Home Wi-Fi Safe in 7 Simple Steps | Norton
Wireless security - Wikipedia