Sony ericsson z550i insert sim - Sony Ericsson Z550i Cellular Phone

SOURCE: insert correct sim card

i you should try a software update, you can get this from www.sonyericsson.com/support. hope this helps

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SOURCE: Sony Ericsson Z550i Bluetooth

change blue tooth ic

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 this is your solution nirma. 
http://gallery.mobile9.com/f/23259/

Steve Brown

• 688 Answers
• Posted on May 28, 2009

SOURCE: MASTER RESET CODES FOR SONY ERICSSON

Here are the Master Reset codes for your phone.

Master Reset / Codes
Accessing the Service Menu - Move joystick right, press * key, move joystick left twice, press * key, move joystick left, press * key.
Checking Firmware Version - Move joystick right, press * key, move joystick left twice, press * key, move joystick left, press * key, press 1 key twice.
Show IMEI # - press * key, press # key, press 0 key, press 6 key, press # key
Manual brightness adjustment - While in camera mode, press and hold * key and move joystick to lower brightness, press and hold 0 key and move joystick to increase brightness
Quick ScreenSaver - Pressing # and * at the same time
Show screensaver and lock keypad - press * and lock keys
*#0000# - Reset language back to english
Hard Reset -Hold power for 10 seconds