I have a GO LIve 820 with a sim slot. With no sim in error code is 10 which is correct. with an old mobile sim in error code is 107 not connected. The only answer TomTom gave is that the sim is programmed by the sim supplier?? Why would you make a unit that the customer could change the sim. Can I use a vodaphone data sim? The serial number of this unit is FU2333Y00374. If I try to buy Live services TomTom says that I can for this unit?