I wouldn't say your devices are owned, but you should expect being monitored and your communications being recorded.
You could make an argument about the security of the modem of your devices, as that was often a target due to it not being particularly secure and it having wide access to your device, but I believe that started changing some years ago when this started being a more widely reported issue.
You could make an argument about the security of the modem of your devices, as that was often a target due to it not being particularly secure and it having wide access to your device, but I believe that started changing some years ago when this started being a more widely reported issue.