How does FirebaseUI/Firebase auth authenticate a mobile number without OTP after 1st attempt? -


i using firebaseui , firebase authentication authenticate users using phone number. during testing saw when first used phone number sent otp after have uninstalled , installed app many times not ask otp , verifies phone number , logs me in. know how firebaseui/auth doing it. linking android device id phone number or saving in shared preferences saved on cloud?

if not case how firebase ui/auth doing ? . app has location permission.

firebase tries keep data in device if deleted. called making backups.

i think related question

you need add these lines in manifest file inside application tag:

android:allowbackup="false" android:fullbackupcontent="false"

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