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May be your phone is locked with some particular network.Hence when you insert other networks it shows the error message "Invalid Sim"...If you want to use the Samsung C3303 with other networks you need to unlock it.To unlock you can approach Simpleunlocking.com and get the requires unlock code along with free unlock instructions.
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.
take the memory card out of the phone and then try all of the options
to reset to factory defaults etc and if it is related to the memory
card it will just give you an error message of some description to
state that it cant erase the memory card because you do not have one
change the optional memory to memory card as the phone memory is filled completely.generally messaging uses the phone memory to operate.Messaging->options->settings->other and change the memory is use to memory card.that should solve the problem. This problem is certainly not with the memory card.hope this helps you out.
buy a new one .but next time when u want to format ,connect to pc suite via pc and then select memory card and delete file by file but never delete an instal program otherwise it will be corrupt again.so if u want to delete instal promgram ,go to tool / application manager and delete it from here.