[this seems to be a very old thread that has been revived, but I'll respond to the question anyway. Perhaps this belongs in the UK forum though...]
nisherm wrote:if you are from the North and travel to the South do you not get large mobile phone bills for data usage of the GPS?
Is there a way you cant be charged by mobile networks?
Short answer: yes, once you cross the border and start roaming on a network on the other side, they'll charge you hefty roaming rates, however:
nisherm wrote:I got charged £20 for driving around Portstewart (says I was in Eire thats data usage for you) by my mobile company o2.
I dislike O2 (for all sorts of reasons) but switched to Three last year. Although I haven't tried it, they have this "Three at home" thingy whereby you got charged the same rates you would on your home network when you're roaming in another country if Three also operate in that country *and* you're roaming on Three
Otherwise, I imagine this is a common problem anywhere there's a land border and different mobile operators on either side of the border. It'd be nice to be able to move in and out of adjacent jurisdictions and roam freely without the risk of large bills!
++David \ davidg666