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Hi if your sony ericsson WT13i mobile is displaying messages like insert correct sim ,sim invalid and so on once you insert your sim in it then it mean your phone is locked to some other network provider due to this it wont accept any other GSM sim until you unlock it .You can easily unlock your phone using sites like Mobile-Unlocker.com here they are rendering network unlock code for all mobile models at reliable cost .You first check that whether the code is available for your country and network provider .If yes then pay for it and unlock your phone then freely use it with any GSM sim .
Try with another sim card, clean the sim connector of your phone, reset you phone to Factory Setting (default) using 12345. If you can open it, clean the mobile thoroughly using iPhone solution. This problem is caused by Firmware problem and Hardware problem as well. OR: New Software Reinstall in the Phone
Your phone has no
contact with your SIM card. We recommend that you: ·Clean the connectors on the SIM card with a soft brush, cloth or
q-tip moistened with any type of unflavoured, colourless alcohol. ·Check whether the card is damaged or worn in any way. If your SIM card is
damaged or does not work properly after cleaning, please contact your operator
to obtain a new SIM card.
Error messageInsert Correct SIM
Your phone is probably
SIM-locked to a specific operator's SIM card. This is usually the case when you
buy the phone from an operator. SIM- locked phones may be unlocked – contact
your operator for more information. I think that your W880i was unlocked by a patch before updating, and now, it's relocked because of the patch will disappear when you install new firmware.