"I am an existing customer, that doesnt help the fact I have a job to be at on Friday, tarrifs better be good to make this mess justified," one wrote.

"Sorry, but that's a real kick in the teeth to those of us who have been loyal customers for years," wrote another.

O2's press office hasn't responded to Macworld's questions on the matter, but the company will have an online stock checker that'll be live from 14 October so you can see if it is worthwhile making your way to your .

UPDATE 1815BST: O2 has confirmed to Macworld that the iPhone 4S will only be available in store to existing customers on 14 October and said that it would be releasing pricing details "well in advance of the iPhone 4S going on sale".