Traveling internationally is so much fun. Congratulations on your awesome, new Samsung 6! Your APN should update automatically when you put in your SIM card. If it doesn't I would reach out to your wireless provider in the UK. Happy travels!
AllisonC_VZW
Follow us on TWITTER @VZWSupport
If my response answered your question please click the _Correct Answer_ button under my response. This ensures others can benefit from our conversation. Thanks in advance for your help with this!!