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I make app with Admob ads and it not work properly. When I want to test this on smartphone I get error
W/Ads: There was a problem getting an ad response. ErrorCode: 2 Failed to load ad: 2
To add admob to this app I used code from oficial tutorial https://developers.google.com/admob/android/quick-start#give_your_app_an_ad_unit_id
I test it on Xiaomi Redmi note 2. When I use test mode in that code I get the same error.
The same thing happens to me on my Redmi note 2. But it works on other devices. I assume there's an adblocker installed initially that I just haven't been able to find yet.