Yes this is another of the so called improvements (sic) if you still have the old text file simply put that back on the device, to update it use NotePad to add or edit entries as applicable. The file format is:
"ABCD Andy/M","0123456789","DEFAULT"
"Mike ABCD/M","0123456789","DEFAULT"
"Tim ABCD/M","0123456789","DEFAULT"
"Alix ABCD/M","0123456789","DEFAULT"
"Tony KABCD/W","0123456789","DEFAULT"
"Tony KABCD/M","0123456789","DEFAULT"
"Brian MABCD/W","0123456789","DEFAULT"
"Brian MABCD/M","0123456789","DEFAULT"
"Dennis ABCD/M","0123456789","DEFAULT"
"Mike ABCD/M","+0123456789","DEFAULT"
"NAME/W" = Work Number
"NAME/H" = Home Number
"NAME/M" = Mobile Number
In the end I got so fed up with calls crashing out and the crap sound from the built in speaker I purchased a dedicated car kit which lets me have music/ instructions from the TomTom via the car speakers and phone conversation is also played through the car speaker system, far better than using the PND for handsfree - Mike