INFO RE iPHONE & FRONTIERVILLE?

My hubby is ready to finally give me my anniv, B-day, Christmas, N.Y. Gr Hog day and Valentines Day gift.

We spend a lot of time on the Zynga Facebook games especially Farm and Frontierville. We were at the phone Co yesterday asking about what phones do what and the staff really did not know the answers I need before spending $$$$$$ on a phone. Does ANYONE know for absolute certain any phone/mobile device etc that will allow us to take our games with us when we cycle or hike etc. I need Frontierville total use, to fill my requirements. I know iPhone does Cafe' world and Farmville, does it do Frontierville and Mafia, Poker??????.....all the info you can shoot me will be perused and taken to the store to be verified so don't feel like you can't answer because you are not positive... I just need info, lots of it to shop and make this MAJOR purchase. Thank you for your help.