Settings
Troubleshooting
You can check for software updates and, if necessary, reset services on your device.
System updates
Check for and install available software updates for your device.
◌From Settings, tap 
System updates for the following options:
•Download and install: Check for software updates.
•Last update: View information about the last software update.
•Update PRL: Download and install the Preferred Roaming List update.
•Update Profile: Automatically update your user profile information.
•UICC unlock: Enable the SIM slot to use another carrier’s SIM card. Contact your service provider for assistance.
Reset
Reset device and network settings. You can also reset your device to its factory defaults.
Reset settings
You can reset your device to its factory default settings, which resets everything except the security, language, and account settings. Personal data is not affected.
1.From Settings, tap 
General management > Reset > Reset settings.
2.Tap Reset settings, and confirm when prompted.
Reset network settings
You can reset
1.From Settings, tap 
General management > Reset > Reset network settings.
2.Tap Reset settings, and confirm when prompted.
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