If you are an Oi broadband subscriber, your username for Fon is your mobile phone number + your area code, i.e. 2136442789, your password is the one you normally use with Oi. If you haven't set an Oi password yet, use the "CPF" of the (mobile) account holder.
Should you have forgotten your password, you can reset it clicking here.
Connecting abroad (outside Brazil)
To connect outside Brazil, add @oiwifi to your username to create your roaming username, i.e. 2136442789@oiwifi. Start a session with your roaming username and your normal password.
For more information about how to connect, please click here.