I have an iPhone4 and have used 2degrees since September. I live in Cambridge and recently had a week in Auckland and a weekend in Whitianga on the Coromandel.
While entering AK, just past the bombays, I lost signal completely and had to manually set 2degrees as my network, as previously I was roaming on vodafone. I used a 1Gb pack for the week which was fast and tethered it to my laptop. Worked awesome.
I then reset my settings to roaming 'on' and 'automatic' network selection before venturing home, as I thought this would stop me needing to choose the network again.
Not.....
Coming into Pokeno..... No signal again.
Am I doing this right? And do I have to choose my network when ever I enter a 2degrees network area?

My next issue was in Whitianga this weekend.
All I could get was a 2g signal although vodafone have full 3g and extended 3g coverage in that area. I know this as my father uses a vodem stick and it runs at 3g speeds and the vodafone coverage maps. Is this a vodafone thing of keeping data competition out of the area by having 2degrees running at such pathetic speeds?

Cheers