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On a prop account, having your phone ready as a backup way to flatten positions is one of the cheapest forms of insurance there is.

The situations where I have needed it: a VPS freezing mid-trade, my home internet dropping during London, and once a Windows update that restarted my PC with a position open. Each time, the phone app let me close the trade within a minute.

How I set it up:
- The broker or platform app is installed and logged into the challenge account, not a demo.
- I test it on mobile data, not Wi-Fi, because the reason I need it is often that my internet is down.
- I know exactly where the close button is and practise closing a tiny position on a Sunday or on demo.
- Two-factor authentication works on the phone without needing the PC.
- The phone is charged and on the desk, not in another room.

A test I do before every new challenge: open a micro position from the desktop and close it from the phone. If anything fails, I fix it before the first real trade.

Some firms have rules about trading from multiple devices or IP addresses, so check that first. Most only care about copy-trading or account sharing, but read your own terms.

Testing on mobile data instead of Wi-Fi is the line most people miss. If the home connection is the problem, a phone on the same router is just a second screen showing the same frozen state.

One thing to check before you rely on it: some mobile platforms don't have a close all button. On those you close each position one by one, so if you scale in with three or four tickets, the one minute flatten can take a lot longer than expected.

I timed mine once from picking up the phone to the last position closed. It was about 40 seconds for one position and over two minutes for four, which changed how many separate tickets I'm willing to hold.

The two factor point is a good one, but think about the case where the phone itself is the problem. I keep backup codes printed with the paper notes, so a flat battery doesn't lock me out of the desktop as well.

Do you keep the stop on the server at all times, so the phone is only for closing early? I treat it that way, so the phone never becomes the only protection.

The risk I did not expect with a backup phone was that it slowly turned into a second trading screen. After the first flatten from mobile I started checking it on breaks, and once I opened a tiny ticket from it while away from the desk.

So the phone can close, never open. One-click is off in the app, and any order opened from mobile on a prop account gets logged as a rule break.

The attached chart is an illustration of a timed phone flatten on EURUSD with four separate tickets opened from the desktop. They are closed one by one on mobile data, with the clock running from pick-up to last fill.
On the IP point I also kill any phone VPN before opening the challenge app. A tunnel through another country can look like two locations at once, and some firms flag that harder than device count.

LondonScalper, a firm has never queried my mobile logins after a flatten test, but I still log the test in the journal. Curious whether that review email has ever landed on your side.