I don't know but Corrie doesn't seem like a huge internet person. He seems outgoing, gregarious, preferring to meet and talk to people in person. He seems more of an action person, which would fit with joining the RAF? The thing with this image of him is that it would fit to be a bit of a risk-taker, and rather than just being oblivious to risk, he might find risk exciting.
If he can get what he wants out of a relatively basic phone, then why not save the money to spend on his beloved car, trips back home, nights out, etc?
It's a Windows phone, he's can't be a techy type? Some of those cheaper windows phones take good pictures, Corrie seems to like taking selfies, chatting on the phone, a little bit of chat apps with family and friends...if you know that's all you want, then the sensible thing is to not buy a really expensive Iphone that could get damaged or lost.