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Yep, I have the same issues with my TTG 700 and my N70. What software version are you running on the TomTom? I'm currently using v5.201 & this doesn't support any N series phone, so I had to choose the 6680 from the list.
TomTom have released a recent software update, v5.420 which is meant to be compatible with more models but I am sure I have read that this version supports the N90 but not the N70 as of yet.