international sim card?

Hi.  I have an iphone 7 and basic Visible service.  I will be traveling to the UK in a couple of months and wanted to know if purchasing a prepaid international SIM card is an acceptable solution.  We prefer not to purchase the Global Pass option.


So my questions are - 1) would international SIM cards work for an iphone 7 with Visible service? and 2) where is the best place to purchase one of these SIM cards?  Thanks in advance.