To make the Android mock location app work properly, developer mode needs to be enabled. Here are the steps to activate developer mode and make your fake GPS application ready to use:
Step 1: Navigate to Settings > System > About phone;
Step 2: Tap Build number 7 times, then a notification “You are now a developer!” pops up;
Step 3: Return to System > Developer options > Select mock location app;
Step 4: Choose the spoofing app you want to use.
Phones published by Android manufacturers may have different interfaces, it’s recommended to follow similar steps to enable developer mode.