on 25-03-2019 20:44
Make sure that *just* the Upgrade is in your basket, @Meraki22 - if you want to buy additional items, like a case or earphones, make a second order, don't add it to the upgrade order.
If you are entering a Discount Code, sometimes the "Checkout" button gets greyed-out, perhaps better to call into an O2 Shop for the upgrade if possible?
Good luck getting your upgrade processed.
on 25-03-2019 21:00
OnePlus 6 (O2 & Sfr), Z3 Tablet (Three UK), iPhone7 (EE)