Hello! I see you're having trouble logging into the 开言英语 OpenLanguage app on your iPhone. Let's get to the bottom of this together.

First, could you please clarify a bit more for me?
- Are you seeing any specific error messages when you try to log in?
- Is this happening with your usual login method (email/password, social login, etc.)?
- Have you been able to log in successfully before, or is this your first time trying the app?

Meanwhile, here are some general steps to try on your iPhone with iOS 18.7 that often help with app login issues:

1. Check Internet Connection
Make sure your iPhone is connected to a stable Wi-Fi or cellular network.

2. Force Close and Reopen the App
Swipe up from the bottom and pause to open the app switcher, then swipe the OpenLanguage app off the screen to close it fully. Reopen the app and try logging in again.

3. Restart Your iPhone
Sometimes a quick restart clears temporary glitches. Hold the side button and volume up until you see "slide to power off," then turn it back on.

4. Update the App
Visit the App Store, search for 开言英语, and see if there’s an update available. If yes, update and try logging in again.

5. Reset Network Settings (if connection seems problematic)
Go to Settings > General > Transfer or Reset iPhone > Reset > Reset Network Settings. Note this will remove saved Wi-Fi passwords, so have them handy.

6. Check Account Status
Ensure your user account is active and not restricted. Sometimes login issues relate to account problems.

If you’ve already tried these or still can’t log in, please share the exact error message or behavior you see. That way, I can guide you with more specific steps or check if there are any known service issues.

Looking forward to your reply!