I use my iPhone for tethering and I get calls while I'm using it sometimes and would like to be able to get the call without it knocking me offline all the time

I use my iPhone for tethering and I get calls while I'm using it sometimes and would like to be able to get the call without it knocking me offline all the time. Granted not many people have tethering enabled on their iPhone as it's not officially supported, but hey, it matters to me (and I'm sure plenty of other techies that have iPhones).