Binance for iPhone
At the moment (on June 26, 2019) Binance app for iPhones is not available neither on iStore nor on Binance website.
There is however a desktop beta version of Binance app available for iOS (via this link: https://www.binance.com/clientDownloads.html), that some users have been able to successfully download and install even on their iPhones.
If you want to access your Binance account from your iPhone, you can always use their online platform. Simply visit their website, log in and you will be able to send or receive your coins and also trade.
Though it might not be the most practical thing to trade via online version on your iPhone as it makes it a bit difficult to navigate around, it is feasible.