Binance: The well-known cryptocurrency exchange Binance provides a convenient smartphone app for trading cryptocurrencies. The programme provides a straightforward and user-friendly interface for buying, selling, and trading different cryptocurrencies. It is free to download and use. Additionally, it provides tools like price charts, order histories, and real-time market information.

Coinbase: Another well-known cryptocurrency exchange with a free mobile app for trading cryptocurrencies is Coinbase. The app is made to be simple to use, making it appropriate for new users. It enables users to manage their cryptocurrency portfolios as well as purchase, sell, and exchange cryptocurrencies. Additionally, it has features like recurring purchases and price alerts.

Kraken: A well-known cryptocurrency exchange called Kraken provides a free smartphone app for trading cryptocurrencies. The programme offers a straightforward and user-friendly interface for purchasing, selling, and exchanging different cryptocurrencies. For more seasoned traders, it also provides complex trading options including stop orders and margin trading.

Robinhood: A well-known commission-free trading program, Robinhood also allows for bitcoin trading. The programme is renowned for its user-friendly UI, which even beginners can use. It provides features including real-time market data, price notifications, and fee-free buying, selling, and trading of cryptocurrencies.

eToro: The social trading platform eToro enables users to trade stocks, cryptocurrencies, and other assets. Users can mimic the transactions of experienced traders using the app’s copy trading feature, which has a user-friendly interface. Additionally, it provides a virtual trading option that enables users to practise trading without putting their money at risk.

Please be aware that trading cryptocurrencies carries dangers, thus before using any trading apps, you should educate yourself on the subject and be aware of these hazards.