Interesting comment near the end of this story about the Western train line & Vodafone coverage.
http://www.nzherald.co.nz/section/1/story.cfm?c_id=1&objectid=10430505

Waitakere has been a Vodafone black-spot for years, come on Vodafone, how about a cellsite out this way? Maybe you could apply to the Commerce Commission to force Telecom to let you co-locate on theirs?