The only workaround that I know of (other than remote desktop) is to have an EA running on a 'full-fat' MT4 platform somewhere e.g. VPS
Place limit / stop orders (far away from current price) on the mobile app as a means of communicating with your EA.
e.g. You want to do *something* with your EA. Place a Buy Stop on your mobile app. Your EA on your VPS sees the new pending order, does *something* then deletes the pending order. You want to do *something else* on your EA. Place a Sell Stop on your mobile app. Your EA sees the new pending order, does *something else* then deletes the pending order.
It is far from ideal, but it can work.
OK! Understood! Alternatively, you could run a simple web-service on your VPS with a light-weight web UI that would inter-connect with the EA on MetaTrader.
Hello. Could you kindly give more information about where such a "simple web-service" might be available? Thank you.
In addition to the reasons stated above by others, RemoteDesktoping to the VPS from a phone is not good because of the size of the mobile screen.