Sounds like a relatively straightforward, fast, and painless experience, although you'll also have to actually enroll in 2SV (2-Step Verification) by adding your Google account to your Android phone (running OS version 7.0 and up), then choosing said device from a list of options found under the "Add security key" menu of your 2SV settings.
The Android built-in security key was introduced by Google during Cloud Next 2019 to provide a simple way to prevent phishing attacks which are now a huge threat both home and business users by blocking malicious sign-in attempts.
To use it, users will have to have Bluetooth enabled on both their iOS and Android devices, so the Android smartphone can sign and authorize any login attempts for Google accounts initiated from the iOS counterpart.
This feature was announced earlier this year, when Google confirmed working on a Bluetooth-based protocol which would allow Android devices to serve as a security key for 2FA (two-factor authentication).More news: La Liga fined for spying on fans via app
This passwordless authentication method was initially available only for ChromeOS, macOS, and Windows 10 devices.
On desktops, the 2-step process works via Google Chrome communicating directly with your Android smartphone - for iOS, your Android phone connects to the Google Smart Lock app on your iPhone/iPad.
Users can activate their Android's device inbuilt security key by following these steps and immediately use it to verify logins on their iPhone or iPad device with this procedure. "While Google automatically blocks the majority of unauthorized sign-in attempts, adding 2-Step Verification (2SV) considerably improves account security".
It requires the Google Smart Lock app to restrict access to this company's online services.More news: Donald Trump Jr. meets with U.S. senators for fresh grilling
Check your Android smartphone, it'll receive a notification.
Also, iPad owners with Android phones aren't that unusual.
You'll be prompted to verify the sign in on your Android device.More news: MPs may have run out of options to block no-deal Brexit