I had no problems with my Samsung SGH-F480 until today when I turned it off, now it won't turn back on..it is just stuck at the start up screen. Any advice? Thanks

maybe it is samsung f480....you can reset your phone to back in factory setting....
1.TURN OFF THE PHONE
2.TURN ON
3.TYPE *2767*3855# and wait until it is reboot ...now the phone is not asking for password when you open your message

samsung sgh t939 sim network unlock pin

ned reset code for samsung sgh-f480

you can try to hard reset *2767*3855#

try FULL reset by typing: *2767*3855#(star 2767 star 3855 hash)

it will be a screen problem so contact samsung service center

hard reset *2767*3855#


All Samsung Hard Reset Codes
In those steps:

1.)*2767*3855#
2.)*7465625*638*00000000*00000000#
3.)#7465625*638*00000000#

Now your phone is unlock forever Permanent



Here is Samsung F480 Secret Codes

Admin Settings: *#6984125*#
Admin Settings
Internals (sub menu): *#9072641*#
Developer Settings: *#0523#
Camera test mode:
Press *#36287# key string in the dial screen to enter camera test mode -
[1] Auto focus [On]
[2] ISP firmware write
[3] ISP firmware version check

[1] Press the "1" key to disable auto focus. In order to enable auto focus, press the "1" key again.

[2] Press the "2" key to write the ISP (Camera Module) firmware. “ISP firmware write [Please wait]” will be displayed during 2 minutes. Then "ISP firmware write [SUCCESS]” will be displayed when the firmware upload finished.

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press Camera button + volume down + power button ( together )
if the mobile turn on and show ( download or any word .. so you can fix it by changing the software )

hard reset *2767*3855#