Three joins the iPhone 4 launch party

Three will sell the iPhone 4 in the UK from 24 June

Three is the latest operator to add the iPhone 4 to its line-up, meaning that all of the UK's major mobile networks will now offer the device.

The operator confirmed the move in a short statement almost identical to that released by T-Mobile on 8 June.

However, Three added that it will stock the phone from the 24 June launch date, a detail omitted in T-Mobile's announcement. The company also confirmed that customers can pre-order the iPhone 4 from 15 June.

While none of the networks has announced tariff details, O2 has made the first move by offering an upgrade option. Customers can cancel their existing contract by paying a one-off charge equal to £20 for each full month remaining.

It is expected that potential customers will be flooded with enticing deals closer to the 24 June UK and US launch date, as the major operators compete to gain the upper hand in an increasingly crowded market.

The iPhone 4 was unveiled by Apple chief executive Steve Jobs at the Worldwide Developers Conference on Monday, and features a new touch-screen display, improved battery life and an HD-ready camera.

Analysts have reacted well to the new model.