Bring it into a Carphone Warehouse store (for some products it's quicker to go straight to the manufacturer).
Trade in online, over the phone or in store.
Whatever your delivery question, here's the answer.
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If you're changing network, you need to contact your current service provider and ask them for a PAC (Porting Authorisation Code).
Find out what reception is like where you live - we've got all the networks covered.