A lot of people use Metatrader applications on phones. One of the common questions is how to add a custom indicator to mt4 iPhone.
It is impossible to add custom indicators to the MT4 iPhone app because Apple does not allow adding any new custom indicators besides the default list of indicators.
If traders want to use a custom indicator in MT4 and at the same time to use a phone Mt4 application, the only solution is to use a remote connection to their PC. On VPS or PC, traders can set Mt4 desktop application, set custom indicators, and then using remote connection application on iPhone access to desktop PC.
There is a lot of free remote access application for iPhone such as remote desktop, mt4remote, Teamviewer, Vnc viewer, etc. Using this idea, traders can use all capabilities of the Desktop MT4 platform using an iPhone.