Android Firebase Phone Auth Not Receiving SMS Second Time

In my case, I have my number on

Phone numbers for testing (optional)

Removing it from there, firebase started sending SMS Code to my number. Spark Plan offer 10k phone auth per month. So that you can test and deploy your app without paying a penny.

In case someone is not getting the concept or reason of not sent sms again then please go through on my below details. I have been confused for very long time that why I didn’t get sms for second time, third and so on..

First Read the original documentation:


This method is called in two situations:

  • Instant verification: in some cases the phone number can be instantly verified without needing to send or enter a verification
  • Auto-retrieval: on some devices, Google Play services can automatically detect the incoming verification SMS and perform
    verification without user action. (This capability might be
    unavailable with some carriers.)

What I found:


is only called when instant verification or auto-retrieval occurs.

When you try this for the first time you will get the otp code
from Google but the next time you try it, it can cause instant verification
to get active.

You can do:

So if you are debugging and having problem with not
receiving otp code from google just disable your sim card and enable it
again. This will help you in getting the otp codes from google again for
one more time until you enter your code and instant verification gets
activated again

Please note:

I don’t think there is any way you can disable instant
verification as of now. But you can always optimize your code in a way it
doesn’t create any problem for you and your users.

If you want to explore more then please check the thread: Click here

You must clear data for this app from phone. If not then run remove app and restart your phone will clear all data related with this app and re-run it.

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