Does signing up with my mobile number affect how I log in?

Yes. If you sign up with your mobile number, it becomes your Dexcom user ID. You’ll use it to log in to all Dexcom apps and services.

Log in with your mobile number
	On the log in screen: Tap the circle next to Mobile phone. Choose your country and enter your mobile number. Tap Next. On the next screen: Enter your password. Tap Log in.