Just who is providing all the iPhones that will be offered to potential T-Mobile customers as part of a new program that lets people test drive the carriers network for a week? Thats according to T-Mobile CEO John Legere, who said Cupertino is doling out the now nine-month-old handsets free of charge. T-Mobile thinks 1 million people will test drive phones The test drive program, which was announced today at the companys Uncarrier 5.0 event, lets anyone take home an iPhone 5S that runs on T-Mobiles network, and comes with the companys unlimited plan.