How To I Reset My Phone To Work Again?

i added a contact in my phone, an it shut off on its own an it keeos showing the welcome note, an thats it. how to i get it to work right again?

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General Support
... picture account settings clears the account settings and requires you can use it again. Reset Phone: Resetting the phone restores all Bluetooth devices follow the steps below : Remove All Bluetooth Devices Delete All Calendar Events All Contacts Delete All Downloaded Content Delete All Call Logs All Images/Photos All Sounds/Ringtones All MP3s...
General Support
... 7: Change PIN Code 8: Change PIN2 Code 9: APN Control 7: Reset Phone 8: Restore Phone 9: Airplane Mode 5: Calls 1: General 1: Show My Number 2: Auto Reject 3: Call Answer 4: Auto Reply 5: Call Status Tones 6: Alerts on it. 1: ADDRESS BOOK 1: Contacts 2: Groups 1: Family 2: Friends 3: Work 3: Favorites 4: Add New Contact 5: Service Number 6: Address Book Settings 1: My Business Card 2: Speed...
General Support
... 3: Calibration 4: QWERTY Slide Setting 5: Auto Keypad Lock 6: Security 1: Lock Phone 2: Lock SIM Card 3: Check PIN Code 4: Lock Applications 5: Fixed Dialing Mode 6: Change Phone Password 7: Change PIN Code 8: Change PIN2 Code 9: APN Control 7: Reset Phone 8: Restore Phone 9: Airplane Mode 10: T-Coil Mode 6: Calls 1: General 1: Show My Number 2: Auto Reject 3: Quick Reply 4: Call Answer 5: Call...