20 Most Recent Sony Ericsson CK15A TXT PRO WHITE US Version Unlocked Phone - Page 8 Questions & Answers

Your SIM code was locked because you gave it 3 times incorrectly and now phone asks for the PUK code to unlock the SIM. PUK stands for 'PIN Unlock Key'. It's a unique code that is linked to your specific SIM card and is usually 8 digits long. The PUK code is unique to your SIM card, so you can only get this from your mobile network. Sometimes they will give you this when you first get the SIM card, but not all networks do this. If you cannot find it, give your mobile network a call or visit their Cutomer's Service and they will be able to give you the PUK code after you have answered some security questions.

Write your answer...detach the sim from phone clean the contact points of the sim. if possible rub the sim contacts with a pencil erasor. reinset the sim and check. if problem persists its better to take help of service centre.
thanks.

Perform a hard reset, this may resolve your problem.

http://manualsonline.com/ good luck.

To get a free unlock, you will need to contact your carrier. Usually the phone must be either A. Bought outright and owned. Or B. Past 6 months of use on prepaid or if on a contract, must be completed or paid to opt out. The carrier will not give unlock codes to phones that do not meet these requirements also including black flagged phones ( stolen or lost). If you can't meet the reqs , then you will need to pay someone or find a rooting guide to do it manually. Any good flasher(carrier flasher, not Rom) can do this for you very cheap, good luck

your phone maybe locked to the original carrier and you will have to get the phone unlocked for other carriers.

you can't simply log out of gmail, unfortunately. you have to delete the account, as rediculous as this may seem, the same applies to Yahoo mail.

call sony,we are not an estimater service,does it need fixing?

get a new battery or hard reset,push power and volume down for 30 secs

The bigger question is why would youbwand to hard reset your phone? Is it because you are having problems or because you plan on selling it and wish to clear it of all personal data?

i can not open my inbox for sony ericson p990i