Apple has opened its store doors for pre-orders of the latest Apple iPhone on Tuesday morning as promised, opting to sell the phone unlocked in the UK.

The news will be welcomed by those looking to use the handset abroad with a foreign SIM and save people the worry and hassle of having to work out how to "jailbreak the device".

The 16GB version will set you back £499 and the 32GB will be £100 more than that at £599.

Currently only the black iPhone 4 is available for pre-order though, we understand the white version will be available shortly after the 24 June launch date.

The mobile operators in the UK; O2, Orange, Vodafone, 3 and T-Mobile have yet to confirm prices for the devices and whether or not they will be offering them for free in an attempt to lure in customers looking for the best deal.

O2 has already confirmed, the news of which Pocket-lint exclusively broke last week, that it would be offering its customers the chance to upgrade to the new iPhone 4 on the condition that those customers pay £20 a month for every month left on their contract.

We will keep you posted on the latest news about carrier offers as soon as we have them.

In the meantime, you can read all about the iPhone 4, and decide whether you're ready to take the next-gen plunge in these iPhone 4 guides and features:

- Apple iPhone 4: Everything you need to know

- Should I buy an iPhone 4?

- PHOTOS: iPhone 4 hands-on

- How the iPhone evolved into the iPhone 4

- iPhone 4 vs iPhone 3GS

- iPhone 4 vs HTC Desire

- EXCLUSIVE: iPhone 4 multitasking - massive delays expected

- O2 iPhone 4 price plans emerge

- 3 latest to get its hands on iPhone 4

- T-Mobile latest to join iPhone 4 frenzy

- iPhone 4: iMovie details emerge