A lot of Bitcoin and other crypto currency users have faced issues when they had to submit their private keys to 3rd parties. There is good news for them. Shapeshift is a self-custody platform and it has recently launched an app for iOS as well as android for mobile trading. Now users can safely buy and sell crypto currencies without divulging their private keys to 3rd parties. Although there are other agencies that provide cross platform application development services that have launched apps like this before, Shapeshift is the recent addition.
All you have to do is to enter your email address and a password and you can sign in. As of now, Shapeshift currently supports Bitcoin (BTC), Ether (ETH), Litecoin (LTC), DigiByte (DGB), TrueUSD (TUSD) and ERC-20. But it is in the process of adding more. Bitcoin and other such currencies were introduced to give the people an alternate to traditional financial systems. Right now, users of around 120 countries can use ShapeShift to buy and sell the above mentioned currencies.