Mobile Number Portability
On-Net and Off-Net
The terms 'On-Net' and 'Off-Net' are used to describe call or
messaging types. 'On-Net' is used when your call or message
originates on your home operator's network and terminates to
another mobile number that resides with your operator. It does not
matter if the person you are calling is using the home network or
is off Island roaming with a different provider. 'Off-Net' applies
when the call or message is made on a different network, e.g.
whilst you are roaming, or if you are using your home network and
make a call or send a message to a number that resides with a
different network provider.