Won’t work iirc the receiver and the phone use the same Bluetooth channel. So it’s one or the other. The other channel is dedicated to a pump.
I could be wrong.
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@RachelMaraii if you happen to be using an Android phone, you could use XDrip in addition to your pump, and the T: Connect app so you are able to see both sensors. The new sensor warms up on your pump and T:Connect as it soaks and the old sensor still plugs along on XDrip until it runs out of time. Once the old sensor finally times out, I change the sensor codes in XDrip and pair it and PRESTO! I have all the readings I missed while waiting around for the new one to warm up
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I’ll have to try XDrip! I see it mentioned here so often… I guess I have just been intimidated until now. 
I’ll give it a go!
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@RachelMaraii I would swear I saw a post about someone getting both G7 sensor’s data on one device/chart for the G7. I don’t recall it being on a PDM, think it might have been on Loop on an iPhone and it might have been post activating the newer sensor on the device. Thought it was here on FUD, but might have been on the LoopZulipChat site for programming. Might reduce the # of devices for you. I’ve not tried to do it myself, I haven’t had sufficient trouble with accuracy or starting sensors to warrant it and am comfortable activating a new sensor in the lat 30 min or so of the 12 hour grace period most of the time, but have had issues with the last two days of a G7 life with connection reliability and “Brief Sensor Issues” though that seems to be waning with time.
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It did it for a period of time with my Android phone and the Decxom App where it would show the old sensor and new sensor if they were both running. I think Dexcom killed that though.
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I included such an example in this post:
It doesn’t always show both, sometimes the graph just suddenly switches from the old sensor to the new one at the time the new one is started. I find it very useful to see both the old and new lines, because it helps me know whether the new sensor can be trusted yet. But I can imagine that Dexcom would find graphs like the one I posted somewhat embarrassing because of the drastic errors in the readings of the new sensor, and might want to disable that “so as not to confuse the patient” [or the FDA].
Oh, and my guess as to what is going on with the new sensor reading drastically low is that the Dexcom algorithm may be able to detect that it’s getting inconsistent or jittery measurements from the sensor, and for safety may choose to report the lowest credible BG rather than the most likely value. (Telling me that I’m 50 when I’m actually 90 won’t hurt me. Telling me that I’m 90 when I’m actually 50 can cause a car crash. Telling me I’m 140 when I’m actually 90 can lead me to overdose insulin and then go low.)
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