Best solution is to use your demo account to make a trading system on the specific instrument that would get triggered by the indicator open a position and an email is sent, then setup an email alert on your smartphone when the email comes from IG as I described here but it will be a little delayed.
Also did you know that you can now set Alerts on most indicators via IG platform and no need to be logged in? I know it’s not the same as your propriety indicator but I thought I would mention it.
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