Before using mobile control software like LaiCai, you need to enable USB debugging. New to mobile control? Read: "What is Mobile Control System?"
General Steps
Step 1: Enable Developer Options
Settings → About Phone → Tap "Build Number" 7 times
Step 2: Enable USB Debugging
Settings → Developer Options → Turn on "USB Debugging"
Brand-Specific Instructions
📱 Xiaomi/Redmi: Settings → My Device → All Specs → Tap "MIUI Version" 7 times
📱 Huawei/Honor: Settings → About Phone → Tap "Build Number" 7 times
📱 OPPO: Settings → About Phone → Version → Tap "Build Number" 7 times
📱 vivo: Settings → System Management → About Phone → Tap "Software Version" 7 times
📱 Samsung: Settings → About Phone → Software Information → Tap "Build Number" 7 times
Verification
Connect your phone to computer via USB cable. You should see a prompt asking "Allow USB debugging?"
Check "Always allow from this computer" and tap "OK".