I'm now officially fed up with CoinBase. They rapidly accept my money when Bitcoin price is rising and I purchase, but if BTC has peaked and I need to sell quickly, the app conveniently becomes busy, and cannot process my request to sell.

They're basically forcing me to take losses.

Can anyone recommend a TRUSTED app with an exchange that is quick to process all requests that is also easy to use? I would prefer one in the USA. And one that works on the iPhone.

Thanks.