New FreeLink Mobile Application

Good someone would know if you can use both the free freestyle meter, as well as the mobile free application.
In other words, a new sensor with the meter, after an hour you can also use it with the mobile application,
If, on the contrary, the new sensor with the free mobile application can no longer use it with the meter.
My question would be someone tested both meters after updating to the continuous meter of the free mobile

What reader do you have?
Mine is old, from Free 1.
If you activate with the reader, the FreeLink app does not active alarms.
If you active with the app, do not read the sensor, but I already tell you that mine, the reader, is very old.

I prefer to have the operational reader because it has already happened to me that the sensor dies for LibreLink but the reader measures until the end with Diabox.