Sony V600 사용자 설명서

Possible cause: The two codes that you have entered do not match.

Solution: When you want to change a security code (for example your PIN) you have to 
confirm the new code by entering exactly the same code again. 

Possible cause: Your phone is not receiving any radio signal, or the received signal 
is too weak.

Solution: Contact your network operator and make sure that the network has coverage 
where you are. If so, try to do a new search.

Possible cause: The SIM card is not working properly.

Solution: Insert your SIM card in another phone. If you still get the same or a similar 
message, please contact your network operator.

Possible cause: The phone is not working properly.

Solution: Insert your SIM card in another phone. If this works, it is probably the phone 
that is causing the problem. Please contact the nearest Sony Ericsson service location.

Possible cause: You are within range of a network, but you are not allowed to use it. 
However, in an emergency, some network operators allow you to call the international 
emergency number 112.

Solution: You have to move to get a signal that is strong enough. Contact your network 
operator and make sure your subscription is ok.