Hi there! It sounds like you're encountering an issue where Smart Square Go is only displaying a purple screen on your iPhone. I’d like to help you resolve this.

First, can you please let me know if you've experienced any recent changes to your app or device, such as an app update or changes to your device settings?

In the meantime, here’s a preliminary step you can try:

1. Force Close the App:
- Double tap the Home button (or swipe up from the bottom of the screen if you don’t have a Home button) to open the app switcher.
- Find Smart Square Go and swipe it up to close the app.

2. Restart Your iPhone:
- Press and hold the power button until you see the slide to power off.
- After your device is completely off, turn it back on by pressing the power button again.

Once you've done that, try opening the Smart Square Go app again and see if it loads properly. Please let me know the outcome, and if the issue persists, we can explore more advanced troubleshooting steps together!