Oh I am sure there will be a merchandise opportunity (sorry service provider option) there.Don't worry, I'm sure they'll sign a deal with MetroPCS to offer you prepaid cell phones upon your arrival for a nominal fee!
Seriously though...wifi shouldn't cost you any data credits on your cell phones...but configuring your phone to connect to wifi only and not roaming data is a bit fun considering all the different models!
My comment was more in regards to the previous posters comment about overwhelmed/slow/laggy Wifi and the offered solution of using their data plan. Which is absolutely the easy answer for those with a data plan in country, not so much for us Intl guests. x