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I dont think you can ... never heard of it being played on a phone .... someone may know differently
You can play FarmVille Express which is a sub set of FV, anything you do on Express affects FV, such as changing farms or planting or harvesting. I don't think it works very well but others use it. Currently it is being used as a fix for loading problems. It seems that for SOME players the problem is related to the current farm that they are on so using Express allows them to move to another farm. To access Express you got to m.farmville.com on your iPhone.