Vodafone is international, Europe-based (I think). They are one of the few providers we have down here in New Zealand. Verizon does do business in NZ, but mostly dealing with heavy IT networks. They give Cisco a fairly good run for the money. As far as the trips, it's cheaper here to call cellphone-to-cellphone than cellphone-to-landline. Most of my calls are to the City Council raising an issue regarding maintenance in the city parks. It's always to a landline, and I make sure they never put me on hold.
The difficult may take time, the impossible a little longer.