Thanks so much Crow550 for your reply. Yes, they realize that their device will cease to work after June 18th. I think they are wanting to delay the firmware update. They have heard that there are some issues after the firmware update & perhaps want to wait a few weeks until something more stable is released.
I admit that I am not that savvy when it comes to the OBi devices. I rely heavily upon the counsel from the experts on this forum. My fear is that if firmware updates are disabled for the OBi device, that Google Voice may go ahead & update something on Google's end ... then, if firmware updates are disabled on the OBi device, there could be issues. I just don't know enough technically about this update to advise my family member further.