A. 1. Verify your credentials: Double-check that you are entering the correct username and password. If you have forgotten your password, use the 'Forgot Password' feature to reset it. 2. Clear app data: Go to Settings > General > iPhone Storage, find SmartLinx Go, and select 'Offload App'. This will clear temporary data that might be causing sign-in issues.

B. 3. Check your internet connection: Ensure you have a stable internet connection. Try switching between Wi-Fi and cellular data to see if that resolves the issue.