Question: I was testing my login/sign up feature and for some reason I can't understand Firebase now is blocking all requests from my device.

I've waited one day to try again, but I still have the same problem.

> 
> ERROR:
>  "We have blocked all requests from this device due to unusual activity. Try again later."
> 
> 
> 

What should I do to have access to my database again?

Answer: 
I contacted firebase support and received this message:

> 
> The error "We have blocked all requests from this device due to
>  unusual activity. Try again later." is usually thrown when a user is
>  making SMS authentication requests to a certain number of times using
>  the same phone number or IP address. These repeated requests are
>  considered as a suspicious behavior which temporarily blocks the
>  device or IP address.
> 
> 
> Additionally, **there's a limit of 5 SMS per phone number per 4 hours.**
>  With this, you may try doing the following to resolve the issue:
> 
> 
> Reduce the frequency of attempts to avoid triggering the anti-abuse
>  system Try using [whitelisted phone numbers for testing your app](https://firebase.google.com/docs/auth/android/phone-auth#test-with-whitelisted-phone-numbers)
>  Use multiple testing devices (as the limits are applied per IP or
>  device) Wait for an hour for the quota to lift
> 
> 
> 

I tried to increase the quota as per [@lhk answer](https://stackoverflow.com/a/47651582/3998402) but there answer is the
following: 

> 
> You also mentioned that you have increased the quota to
>  1000 but it didn't work. Do note that this "Manage to sign up quota"
>  field is intended for Email/Password and Anonymous sign-ups.
> 
> 
>
I have added my phone as a test number in the Sign-in method tab.

Actually this error occurs when your quota limit is exceeded.

Just add your number and testing OTP to get it worked.

[![enter image description here](https://i.stack.imgur.com/Oa9dt.jpg)](https://i.stack.imgur.com/Oa9dt.jpg)

> 
> Note: The testing number will not get any message of OTP as we already
>  defined static OTP code.
> 
> 
>