I just purchased the 4S and am having trouble with it at least once a day says Invalid Sim, what would cause this and how do I fix it

I just purchased the I 4S and at least once a day, it will say Invalid Sim, what would cause this and how do I fix it?

Then, if there's any data on the drive that you want to keep, you have to back up before you do anything else -- assuming it's still possible.
Basically you have three options:
1. Install a copy of the Mac OS on an external hard drive, boot from it, and copy the data from the internal drive.
2. Start the problem Mac in FireWire target mode (command-T at startup) and connect it to a working Mac with a FireWire cable. The internal drive will mount as a FireWire device.
3. Remove the internal drive and mount in an external enclosure on another Mac.
Once you've backed up, follow the sequence in the support article linked below. The article is somewhat outdated. Where it refers to booting from an installation disc, you should boot from your recovery partition (if running Lion) by holding down the key combination command-R at the chime.
Mac OS X: Gray screen appears during startup

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