The Soft Phone (which can be renamed to whatever you like) is provided for free, with every OBiTALK registered user account. It cannot be deleted.
The OBi Soft Phone account and associated 290 xxx xxx number, is for you to use with the OBiON Android, OBiON iPhone, iPad, iPod touch and OBiAPP for PC. With these "soft" OBi endpoints you can make calls to other OBi endpoints by calling the party's OBi No. associated with their OBi device or soft phone client.
When you download any of the OBi soft clients and log-in with your OBiTALK username + pw, you will be able to bridge calls from these apps to your OBi device(s), and those devices of people inside of whose Circle of Trust you belong. You can either ring the far end OBi connect to the OBi attendant, then speak with the party on the attached phone or make a new call using any of the services configured on the device.
Also, you can use the soft phone with an OBi device acting as the direct dial voice service gateway. Just choose one of the OBi devices in the drop down list in the Soft Phone's configuration and then dial from the app just like you would if it were a regular cell phone (or PC soft client). The call will automatically route out the chosen device using the device's Primary Line to Call Out service, e.g. Google Voice, a SIP service like Callcentric or the analog LINE port.
If you would like to give friends and family access to services on your OBi via the OBiON apps or OBiAPP for PC products, all you have to do is invite them to your OBiTALK Circle of Trust, using the "Circle of Trust – Requests and Invitations" tool in the OBiTALK portal. Once the accept your invitation, they will be able to use their OBi hardware and soft phone clients to make calls using services on your OBi devices.