Samsung Galaxy Note 2 T-Mobile SGH-T889PSATMB Guide

To perform a factory reset, go to Settings > Backup and reset > Factory data reset. Confirm your choice and the phone will reset to its original settings. Remember to back up important data before proceeding.
Check the charging cable and adapter for any damage. Try using a different charger or outlet. Clean the charging port of any debris. If the problem persists, consider replacing the battery or contacting support.
Ensure Wi-Fi is turned on and Airplane Mode is off. Restart your phone and router. Forget the network and reconnect. Update the phone's software if necessary.
Reduce screen brightness, disable background apps, use power-saving mode, and turn off unnecessary features like Bluetooth and GPS when not in use.
Turn off the phone. Press and hold the Volume Up, Home, and Power buttons simultaneously. Release them when the Samsung logo appears. Use the volume buttons to navigate to 'Wipe cache partition' and press the Power button to select it.
Use Samsung Smart Switch to transfer data wirelessly or via USB cable. Install the app on both devices and follow the on-screen instructions to transfer contacts, photos, and other data.
Close unused apps running in the background. Restart the device. Consider uninstalling unused apps and clearing the cache. If issues persist, a factory reset may be necessary.
Go to Settings > About device > Software update > Update. Follow the prompts to download and install any available updates. Ensure your device is charged and connected to Wi-Fi.
Use Samsung Cloud or Google Drive to back up your data. Go to Settings > Accounts and backup > Backup and restore, and follow the instructions to secure your data.
Try charging the device for at least 15 minutes. Perform a soft reset by holding the Power and Volume Down buttons for 10 seconds. If it still doesn't turn on, consider seeking professional repair services.