Provided PAC during ordering online. Had an email from mobiles.co.uk saying it was wrong and asked me to call them. I did and gave them exactly the same PAC again and then they said it was fine. 10 days into new contract had heard nothing about my number being ported so rang Talk Mobile who my new contract is with and they confirmed that mobiles.co.uk hadn't requested the number port. I then had to contact mobiles.co.uk to check that by Talk Mobile processing the port directly it would not affect my cashback and also go back to my old provider to get another PAC as the original one had expired. I then had to provide this directly to Talk Mobile for them to arrange the port. Overall not impressed with mobiles.co.uk and would not recommomend them to anyone.