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Samsung T959 Galaxy S T-Mobile Vibrant  hard reset

Try this first, maybe you have to try it more times, but it shuld work.
1. Power off Galaxy S Vibrant.
2. Press and hold both Volume buttons + POWER.
3. Press these 3 keys until logo appears, then release them.
4. After a few seconds you should see factory menu.
5. Select "delete all user data" with volume button.
6. Press POWER.
7. Scroll down to Yes - delete all user data and press POWER.
8. Select Reboot system now!
All data will be lost!

Keep pressing these 2 buttons + press Power button for 2-3 Seconds
Release only power button, but KEEP pressing Volume up + Home Buttons
With Volume down select wipe data/factory reset (3rd) > Press Power to select.

Source: original link see http://www.hard-reset.com/samsung-i9000-galaxy-s-hard-reset.html

T959 Factory Data Reset via menu

From this menu you can reset your phone and sound settings to the factory default settings.

1. From Idle mode, touch ➔ Settings ➔ Privacy.
2. Touch Factory data reset then touch Reset phone, enter your password, then select Yes to confirm.
The phone resets to the factory default settings automatically and when finished displays the Home


Use this method to hard reset your Samsung Vibrant Black phone: Enter *2767*3855#. Warning! All your data including contacts, messages etc. will be lost! Copy all your necessary data/Contacts/Messages etc. to SIM or make backup to your PC before full reset! Take out SIM card before full reset.

When your phone is frozen take out battery and reinsert it.

Samsung Vibrant hard reset

If you know the hard reset using buttons / keys, pls leave a comment. All comments are welcome! :)

General advice: Before you buy a new cell phone or new tablet, please try the following procedure to repair your device in a software way. First charge your battery, backup your important data if possible and in most cases take out SIM and SD card before doing factory reset. It is impossible to recover your data after doing a hard reset, so online backup is always important. For all of your data, a backup should be done on an external device, hard drive, raid system or media. With or without insurance, if your cell phone lost, damaged or stolen at least your invaluable data is backed up in a safe place. If you are about to sell your phone and you want to wipe your personal data, or if your phone affected with virus you have to do a hard reset. In some cases, you can delete the forgotten password or lock pattern from your device as well. All information is for devices with stock based ROMs. If you are using rooted device, always back up your EFS folder first, containing your IMEI info, etc.! Please also note, that a hard reset operation will not unlock your mobile phone's SIM lock or network lock, but it will remove the unlock pattern, remove the user password or PIN password (NOT the SIM card's 4 digit PIN code). Also note that the firmware version will not be affected in any way, it will not be downgraded, it will remain the same you are using and if you have rooted your device, root privileges remain also unaffected.