Samsung Galaxy W I8150 hard reset
Turn off your phone. Boot into recovery mode by pressing HOME KEY + POWER KEY+ VOLUME UP KEY, @ samsung logo appears, release power key. Keep holding home key + volume up key until android guy. Release al buttons and press the "option" button next to the home key. The screen will grey out and wait until the recovery menu will come out. In recovery menu by using volume up and down. Home button as confirm. - select wipe data/factory reset. Press the menu key and confirm. Select reboot system now. Via comment pls confirm.
Your device freezes or has fatal errors
If your device freezes or hangs, you may need to close programs or reset the device to regain functionality. If your
device is frozen and unresponsive, press and hold [POWER] for 15-17 seconds. The device will reboot automatically.
If this does not solve the problem, perform a factory data reset. In Idle mode, open the application list and select
Settings → Privacy → Factory data reset → Reset phone → Erase everything.
Settings > Location and security > Clear storage: Erase the credential contents from the device and reset the password.
Use this method to hard reset your Samsung Galaxy Wonder I8150: 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.
If you forget your Galaxy W unlock code, bring your device to a Samsung Service Centre to reset it.