Mobile Phones

Today we had a strange thing happen... two of the desktop mobile phones used for incoming and outgoing SMS messages were working and two were not. Finally traced to a very wierd problem... on one of the non-working desktop mobiles there was an incoming SMS message with the phone number showing a something like 3C487A068FD298 - nothing at all like a normal number which should be something like +441211234567. This strange and wrong number crashed the mobile phone, which crashed the program importing it, which locked up the USB connector to which all the mobiles were connected, stopping two of them working, but allowing the other two to continue. Very strange.