Coinbase's mobile apps do not support security keys. If a security key is activated on your account, you will not be allowed to login using Coinbase iOS or Android apps. We hope to support security keys on mobile applications in the future. However, you can use Coinbase in your mobile browsers. Coinbase – Buy & Sell Bitcoin. Crypto Wallet - Apps on ... Coinbase: the simple, safe way to buy, manage and sell your cryptocurrency. We’re the world’s largest cryptocurrency exchange, with over 25 million users across 32 countries worldwide. Coinbase allows you to securely buy, store and sell cryptocurrencies like Bitcoin, Bitcoin Cash, Ethereum, Ethereum Classic, Litecoin, and many more on our easy, user-friendly app and web platform. Here’s