On 30/09/2010 14:46, andy wrote:

Dover-Calais, even inside the restaurant, there's always some coverage
by UK or French networks on the passenger decks. Outside on top, it's
usually though not always possible to select one's UK network from
just outside Calais

You can already pick up French networks at high points in Dover.

Interestingly enough, I was in north Wales once and my mobile phone
started to pick up signals from Meteor, in the Republic of Ireland.