How can I read my sim card to find out which files/data are on it?
On what device? And do you mean the sdhc card in the device? If so, just look at the contents using Explorer (or Finder if a Mac). The card appears as an external drive.
When you connect your device via its USB cable, your TomTom appears as one (or two, if you have the SDHC card installed) external drives on your PC, just as if you had - for example - inserted a thumb drive / USB stick into the USB port.
OK. I may be out in left field here, but WHAT are you connecting to your computer? A TomTom nav device, or something ELSE?
If you are connecting your 920, you should see it separately as a disk drive, and assuming you have a properly formatted SDHC card installed, you should see that separately as a disk drive.
Was the SDHC card being used for something else previously?
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