I received a text from O2 this morning to say that existing customers can now order their 3G iPhone.
iPhone 3G is here
The iPhone you’ve been waiting to early upgrade to. Order from 8am today.
As an iPhone fan, we are offering you a special, early upgrade to iPhone 3G.
This offer is only available at o2.co.uk/iPhone until 11th October 2008. Terms apply.
You can’t upgrade from your iPhone, so you’ll need to go onto your Mac or PC and onto o2.co.uk/iPhone from 8am today. You will also need to have your account number to hand that you can find on top of your online bill.
Demand is expected to be very high, so to be fair to all customers, orders will be placed on a first come first served basis.
Initial successful orders will be delivered on 11th July by courier and will require a signature as proof of receipt.
*Subject to availability. Connection subject to status, new 18month minimum term contract, credit check & direct debit.
I’d love to order my new iPhone, but unfortunately as of 10am today, the upgrade link isn’t working 
And the sales option via the iPhone customer service line (2302) goes to a null tone, but you can’t upgrade by phone anyway.
Only on O2…
UPDATE: You can try an alternate upgrade link – http://upgrades.o2.co.uk/failover/index.html – but so far it’s only produced errors for me.
UPDATE 2: The site is now back online.
UPDATE 3: No it isn’t.