Issues with upgrading

[Philh77]

My wife is having issues with upgrading. I understand that it is possible to have more than one phone on an account. If I were to apply for a new phone can my wife's existing O2 sim be used in the new phone?

[Enlli]

If you apply for a new phone then it will come with a new airtime contract. You will then need to migrate her number across to that.

Cheapest way in the long term is to buy a handset from the manufacturer or the likes of Amazon on their payment system and your wife to then upgrade her airtime contract through the likes of USwitch 

[Philh77]

Thanks for that. Trying to avoid an outright handset purchase if possible but that may turn out to be the easiest way as could do a straight sim swap.