I need to lock my Sony Ericsson k550iphone when i m busy in work.

What are you trying to do ? I hope some of this helps.
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button 12 menus appear that are unique to the Sony Ericcson k800i ...

K800i Secret Menu In this post I will write about a few hidden features of the K800i.
These codes should work on most Sony Ericsson models though, try for yourself.

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Service Menu

The Service menu can be accessed by pressing the following sequence while in the standby screen:

right, *, left, left, *, left, *

The phone now shows a menu titled 'Service' with 5 menu items:

• Service info : Here you can view information regarding your handset such as the model number, software versions (firmware as well as other versions, like camera driver version, etc.)
• Service Settings : Here you can switch USB charging on or off
• Service Tests : Allows you to test every component of your phone, such as the keypad, microphone, speaker, LED, Display, etc. Any fault can be found out easily with this method.
  In this section, You can also check the Total call time, the number of hours you have called.
• Text Labels : Better leave this section alone.
• Discharge Flash : To discharge the camera flash fully.

In addition to the Service Menu, SE's also offer a 'Personalize' menu.
It can be accessed by the sequence
left, *, *, left

But unlike the Service Menu, the Personalize menu is for trained experts only. So it's better not to tinker with these settings. Still, it's cool to know your phone's got all these things under the hood right?

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Want to see something cool?

Access the ServiceMenu. Now Navigate to Service Info > Model Info.

While the Model is displayed, press the folowing key sequence :
2, 4, 6, 8

\m/ SE \m/

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Stop thieves running up huge mobile bills by locking your Sony Ericsson K800i and protecting it with a PIN To protect your phone from unauthorised use you can set a phone lock to stop others using it.
The default phone lock code on the K800i is 0000, so it is best to change this number to one you can easily remember in case it is lost or stolen. To change your unlock code:

• From the Menu screen, select Settings (Figure 1).
• On the General tab, scroll down to Security (Figure 2).
• Select Locks (Figure 3) and then Phone Protection (Figure 4).
• Select Change Code (Figure 5).
• Enter the default code then enter (And re-enter) your new one (Figure 6).

Once you have changed your phone lock, you can then set to either On, Off or Automatic (Figure 7). When it is turned On, you must enter your code when you turn the phone on, Off means you don't need to enter a code. Automatic means that you only enter the phone lock code when a new Sim-card is inserted into it.

You can stop unauthorized use of your J108a phone by activating phone lock protection.

After activating, you will be asked to enter your phone lock code every time you restart the phone.

The default phone lock code is 0000 (zero-zero-zero-zero). It is recommended that you change this to any four-to-eight-digit personal code.

Note: It is important that you remember your new code. If you forget it, you need to take your phone
to your local Sony Ericsson retailer.

To activate the phone lock:

1. Select Menu > Settings > General > PIN codes > Phone protection > Protection.
2. Select 'On' if you want to enter a lock code every time you start the phone, or select 'Automatic' if you want the code to be entered only when the phone restarts after a new SIM card is inserted.
3. Enter the phone lock code (0000 by default) and select OK.

To unlock the phone:

• When 'Phone locked' appears, enter your phone lock code and select OK.

To change the phone lock code:

1. Select Menu > Settings > General > PIN codes > Phone protection > Change code.
2. Enter the old code and select OK.
3. Enter the new code and select OK.
4. Repeat the code and select OK.




This solution was taken from Sony Ericsson J108a user guide which can be downloaded at:

http://www.sonyericsson.com/cws/download/1/835/750/1284993225/J108i-J108a__UG_EN_1241-2576_1.pdf

Hey,
Unfortunatly, the Sony Ericsson W580i is not equippped with that feature. I have browsed the internet looking for a type of software to safely lock folders within this cell phone but, was unsuccessful.
Sorry,
Matt

Sounds like it is locked. Try your SIM card in the phone. If it still says the same thing, take it in to get unlocked. $25-50 to get it done.

You can also search the net for information on how to do this. Most places will charge for the software/info.

Go to Sitting> General> Security>Locks>

There is two option SIM protections and phone protections.
Any protection you want to add you can.

If this thread help you then don't forget to mark answer.

Go to Sitting> General> Security>Locks>

There is two option SIM protections and phone protections.
Any protection you want to add you can.

If this thread help you then don't forget to mark answer.

http://www.mobile2mobile.net/unlock/menu_remote_unlock.htm (for all models)

please go on this site and unlock ur phone

U just istall p.c. suit of sonyerricsson and take backup of ur data,, then u need to flash ur handset from sony erricson service centre.