I have searched the helpline and read a number of comments and articles on this topic and maybe have more questions now than before.
My situation is that we will be in London and area for a week and a half, plan on arriving and getting a rental car at Heathrow and taking off for some sights, winding up in Portsmouth for a few nights, then to London.
I have an Android smartphone (samsung 4G), unlocked, that I plan on using for GPS and Internet, voice less important, we can roam on wifes phone (ATT Int. Roaming) for the few calls we make to each other,and checking in with work (this is actually a partial business trip)
I know the best would be to find a store in London for the Sim, but options are either buy over the internet ahead of time or at Heathrow since I need the GPS right away.
Longwinded set-up, but does anyone have any insight as to either option? preference for carrier/website? a gig would be plenty for a flat rate, pay as you go, I could get by with less. Thoughts?