Probably a really stupid question but want to get DS a new phone for Christmas. His contact is up so was thinking of renewing contract with a better phone. Can i do this in advance and put the new sim in his old phone and then keep the new phone until Christmas day. Possibly changing network from ee to three mobile as ee seems to be so much dearer than elsewhere.
I've only ever done renewals for myself so would of used phone straight away. Seems to be some good black friday deals