How to view connection security
If the security indicator 
is displayed during a connection, the data transmission between the device and the Internet gateway or server is encrypted.
The security icon does not indicate that the data transmission between the gateway and the content server (or place where the requested resource is stored) is secure. The service provider secures the data transmission between the gateway and the content server.
Select Options > Details > Security to view details about the connection, encryption status, and information about server authentication.
Security features may be required for some services, such as banking services. For such connections you need security certificates. For more information, contact your service provider.
Also see:
How to set up the phone for the browser service – Nokia 5500 Sport support
How to make a connection – Nokia 5500 Sport support
How to browse web pages – Nokia 5500 Sport support
How to download content from the internet – Nokia 5500 Sport support
How to change the browser settings – Nokia 5500 Sport support
