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if your keypad is locked with security code in nokia 1600 then you can use this simple trick to unloack the keypad without the security code. first of all press the left soft and you will be asked for the security code. don't enter a security code and press right soft key to get back in the default position now press and hold the left soft key and suddenly a text will appear for a moment."press * now" you can poress star and unlock your keypad.
If you've been using your phone (a lot) for texting, you may be having troubles due to a worn out keypad. You can try replacing the keypad with a new one or - the smarter choice would be to purchase a new phone.
For Keypad lock:
Settings--General--Security--Automatic Keylock--Turn On
As far as locking only your text messages goes, unfortunately sony ericsson does not provide the option of locking indivisual applications.However you can lock your phone i.e put a security code on it.
Follow the same procedure :
Hope it helps
Keep inputting codes into the phone until it asks for a PUK code, if it doesnt already.
Now call up your carriers help number and ask for the PUK code (you'll probably need to know the phones number, also have you paper and a writing utensil out)
Then enter the codes you were given and it will reset the security code and you can get into the phone without a pin code.
Good luck invading her privacy!! ;)
first, take out the battery and press the RED end call key for 15 seconds, then put the battery back in and turn on the phone.
if that doesn't work then try this from the website.
How do I lock/unlock the phone's keypad?
To lock and unlock your phone's keypad, press and hold the left navigation key.
Or, select Menu -> Settings -> Keyguard. Then highlight either of the options and press the OK
button. You can set your phone to lock the keypad immediately, or
automatically if no key is pressed after 30 seconds, 1 minute, or 5