What not to do!

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Don’t remove a transmitter from the box until you intend to use it.
As soon as you place the transmitter in a sensor, or even if you just touch the contacts long enough, the counter (on the transmitter) starts counting the number of days. Since the number of days you can use a transmitter is limited, don’t start the counter unless you intend to start using the transmitter. The best practice is to keep the transmitter in the box until you intend to use it.

Don’t throw away the sensor adhesive covers
The calibration code you need to start is printed on one of them.

Don’t pre-soak
Factory calibration is why you don’t need to calibrate twice a day. You will be interfering with factory calibration if you pre-soak.

Don’t start a G6 (or Dexcom One) sensor unless …
Before you start a sensor, the transmitter must have been outside a sensor for at least 10 minutes. Otherwise, the transmitter will conclude that you are attempting to restart and will fail.
A mistake some make with G6 is to place a new sensor on with the previous sensor still running. Then, they stop the old sensor, remove the transmitter and snap it into the new sensor, right away, and start. Even though the sensor is a new sensor, since the transmitter has not been kept out of both sensors for at least 10 minutes, the transmitter will stop the new sensor and issue an error.

Don’t calibrate to correct more than a 20% error in one shot.
Otherwise, you may get a confused calibration error. Please calibrate as explained here.

Don’t stop sensor thinking you can restart easily.
There is no reason to stop sensor except when you intend you remove it from your body. Other than that, there is a better way to accomplish what you need than to stop the sensor.

When you get a new phone, …
Don’t forget to disable collection on the old phone. Otherwise, both phones will have constant connectivity issues.

Don’t restart a G6 (or Dexcom One) sensor unless you understand the risks and accept responsibility for the possible consequences. The manufacturer does not approve of restarting sensors. You need to read all the details and consequences of a restart and understand that the readings will be incorrect after a restart. I don’t encourage anyone to restart sensors, or anything else the manufacturer does not approve.