I will be travleing oversea for pleasure and would like to bring my iPhone along. However, I do not wish to get outrageous international roaming fees, so I would like to turn only the cell radio off, but maintain the wi-fi capability so I can go online when there's hotspots. Is it possible at all? The airplane mode turns both the wifi and cell radio off. This may be one of many features that Apple have missed. Any help is greatly appreciated!