I suggest going to cell phone repair shop because that is very unusual.
SOURCE: Wrong sim card problem with SE P910i, not P900 but pretty similar anyway
I don't have a solution, but my P910i did this immediately AFTER I did the firmware upgrade. The local repair shop refuses to look at it as the tag and internal IMEI numbers are different. I suspect it was repaired before and the tag not changed. I am still working on it and will let you know. But its xmas and Australia rolls up the sidewalks shuts off the streetlights and stops.
SOURCE: i cant send or receive picture and video messages!!!!!!!!
cantact your network provider and ask for a sim update and a gprs install message this will solve the problem
SOURCE: HOW TO REFORMAT PHONE MEMORY OF NOKIA N73
Delete some unnecessary files in your phone memory like images and videos. Go to your phone gallery and delete some of those. And if you want to use the memory card as phone message storage then go to Messaging - Option - Settings - Other and then Memory in Use, select your memory card.
But if your phone is infected with a virus then you need to format your phone. One sign of infection is your phone keep sending a message randomly from your contacts without your consent.
Use these code and enter it to format your phone:
*#7370# and then the default code is 12345
Take note: Make sure you back-up your contacts or any other important inside your phone.
Hope I make it clear and does makes sense.
Thanks..
Testimonial: "it does not work. My phone asks for a lock code. 12345 is not the default key. It is locked. "
SOURCE: i cant send text messages but can recieve them ive
Switch the phone off. Press and hold three keys together, the green key, the * key and the number '3'. While you are holding these keys, switch the phone on. Don't release these three keys before you see the Nokia logo. or dial *#7370#
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