Encountering Android Error 21 can interrupt your device's functionality, leading to frustration and confusion.

Storing car keys on Android requires a wallet app such as Samsung Wallet or Google Wallet, and usually requires a pairing process that may differ between cars.

Owners of several Android phones have reported being unable to connect to their car's head units via Bluetooth for over a year.

Unfortunately, Google has been slow to deliver a fix. The bug has affected an unknown number of users for more than a year, with no resolution ...