In a nutshell, Skinny's whole reason for being is to strip everything back, so you only pay for stuff you actually want at super low prices. It's based on a model called common sense. Skinny only does award-winning mobile and broadband, and it's all prepaid.
Skinny Mobile is a division of Spark New Zealand Trading Limited, and Skinny happily uses Spark's 4G and 5G network.