Your phone is set to work only with certain SIM cards. Check if you are using the correct operator SIM card.
You have entered your PIN or PIN2 incorrectly.
Enter the correct PIN or PIN2 and select Yes. See PIN on page 6.
You have entered your PIN or PIN2 code incorrectly three times in a row.
To unblock, see SIM card lock on page 66.
Codes that you have entered do not match. When you want to change a security code, for example, your PIN, you have to confirm the new code. See SIM card lock on page 66.
Your phone is in flight mode. See Flight mode on page 59.
Your phone is not receiving any network signal, or the received signal is too weak. Contact your network operator and make sure that the network has coverage where you are.
The SIM card is not working properly. Insert your SIM card in another phone. If this works, it is probably your phone that is causing the problem. Please contact the nearest Sony Ericsson service location.
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. See Emergency calls on page 33.
PUK blocked. Contact operator.
You entered your personal unblocking key code (PUK) incorrectly 10 times in a row.
Troubleshooting 71
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