The dust has only just settled on the official iPhone 4 announcement, but already the major networks are jostling for your custom ahead of the 24th June 2010 launch date.As expected, the current sellers of the iPhone, Vodafone, O2 and Orange, are all selling the new model too. But none have, as yet, announced the bottom-line price for the UK. No surprise there - and there's unlikely to be the surprise of one massively undercutting the other two either. It's likely to come down to your choice of network and the small print of what you get for your money.O2 was first off the mark, saying it will make it as easy as possible for O2 customers still in contract to get their hands on a new iPhone, delivering a new upgrade offer. Details of that should be with us later in the week. In the meantime, pre-register an interest here.But the network no longer has the market to itself. Hot on O2's heels comes Vodafone, which also has a pre-interest page and is talking up its network as the best and most reliable in the UK for mobile browsing and for the iPhone. Vodafone is likely to use that claim to get a chunk of the new users likely to flock to the iPhone 4.So what about Orange? Well, it has also announced its intention to sell, but like the others, is playing its cards close to its chest right now. According to a statement: "Orange UK will launch iPhone 4 on June 24th. Furtherinformation on pre-registration, pricing and tariff plans will be revealed in due course." No pre-registration as yet, but with the company being economical with detail right now, we suspect you aren't missing anything.