Last year I had so much trouble transferring service from my two S3’s to my two S4’s, hours and hours on the phone with their support. I begged them to delete the two S3 numbers and give me two new ones on the S4’s and had to threaten to leave them if they didn’t, they finally relented and the watches magically worked right away.
This year I cut service on the two 4’s when I got the two 5’s and Monday I will have them setup as new numbers. I’m not going through last years hell again, they asked so many questions when I cut service.