Important Notice : This feature is still experimental and is compatible with only a couple of Sagemcom designed gateways. Nexa application is a mobile backup solution. It allows you to register your mobile phone as a backup connection for your WAN network in case your gateway's primary WAN connection goes down. When your internet connection goes down, a notification will be sent to the registered mobile phone, asking the user if he wants to use his mobile data to backup the WAN connection.