Im trying to unlock my wifi on my iphone . Is there a way?

Are you trying to connect to the Wi-Fi network?
If wireless network is secured then you need to know the security key or password for that network.
If you are not sure about the network key/password then you will need to check the settings of the wireless router which is broadcasting that wifi.
Check this link for more information about iphone Wi-fi Network setup

You shold have tha password for the WiFi service you are trying to connect