Following on last week’s launch of the iPhone in the UK, O2’s CEO Peter Erskine told The Times Online that the iPhone is “the fastest selling device we have ever seen.” As Erskine previously mentioned, O2 has been selling tens of thousands of iPhones since last Friday’s launch – and it seems that Brits are still snatching up iPhones at an impressive pace.

However the refusal of both O2 and Carphone, the only independent retailer to sell the phone, to reveal exact sales figures, has raised speculation that the gadget — a combined iPod music player, mobile phone and internet browser — is not living up to expectations.

Over the weekend sales of the phones were reported to be slower than expected at stores in Newcastle, Manchester and Birmingham.