currently got two mobile contracts, one with o2 and one with vodafone (one for me, one for our lass).

thing is we've both upgraded but problem being we prefer each others phones and want to swap.

Ive tried my sim into her new phone and it works fine until I try accessing the internet. Is there a way I can access/swap Vodafone's mobile internet settings for Samsung Z400 instead of O2's which phone is currently now set?