Samsung Galaxy S III Mini Verizon SM-G730VMBAVZW Manual

To perform a factory reset, go to Settings > Backup and reset > Factory data reset > Reset device. Confirm by selecting Erase everything.
Ensure that the charging port is clean and free of debris. Try using a different charger and cable, and check the power source.
Reduce screen brightness, disable unnecessary background apps, and turn off Wi-Fi, Bluetooth, and GPS when not in use.
Clear app cache, uninstall unused apps, and perform a restart. If the issue persists, consider performing a factory reset.
Go to Settings > Wi-Fi, toggle it on, select your network from the list, and enter the password if required.
Ensure Bluetooth is enabled, and the device is discoverable. Try restarting both devices and check for any software updates.
Press and hold the Power and Home buttons simultaneously until you hear a shutter sound or see a flash on the screen.
Check if Airplane mode is off, ensure you have network coverage, and restart your phone. Contact your carrier if the problem persists.
Go to Settings > About phone > Software updates > Check for updates. Follow the prompts to download and install any available updates.
Delete unwanted photos, videos, and apps. Clear app cache and move data to an SD card or cloud storage.