Do I need remove adRequest.addTestDevice in production?

Question

The document does not specify it. I thought we do not need to remove it, because it is our unique device id, the other devices with different id are not impacted. But it is just my guess.

Answer 1

That is correct. When your application is run on a device with that deviceId it will get test ads. All other devices will receive real ads. So you can leave the config in for production.