Can I sell my upgraded phone?

macman

A_Lert said:

If it's not too late, use the cooling off period to cancel that new Sky contract. If your old contract had expired, keep your current phone and switch to a good value Sim only plan, with the right amount of data for you. But do check what signal it uses and use Ofcom's coverage checker. (Sky Mobile use O2's signal which means O2, giffgaff, Tesco, TalkTalk, and Lycamobile will all have exactly the same signal.)

Usually there is no cooling-off period on an upgrade, unless the provider goes beyond their statutory obligations. Which, being Sky, is not likely.