As Apple, Inc. rolled out its much-anticipated iPhone 5 on Wednesday, T-Mobile USA launched a marketing pitch to AT&T customers with older model, out-of-contract iPhones, offering these customers the opportunity to use old iPhones on the T-Mobile network with the added enticement of unlimited voice, text and data for $70 per month. Although T-Mobile— the only major U.S. carrier that does not sell the iPhone—already serves more than a million subscribers who continue to use their old AT&T iPhones on the T-Mobile network, T-Mobile marketing director Harry Thomas told reporters that his company wanted to take advantage of the secondary market created by AT&T customers who wish to trade in their old iPhones for the new iPhone 5 and who are likely to sell their old devices on eBay, Craigslist and other online sites. Because the wireless offerings of both AT&T and T-Mobile are based on the GSM standard, iPhones that were used previously on the AT&T network will work on the T-Mobile network. (iPhones marketed by CDMA carriers Verizon and Sprint Nextel, however, are not compatible with the AT&T or T-Mobile network.) Before migrating out-of-contract iPhones to T-Mobile, customers will need to ensure that the devices have been unlocked by AT&T. Customers who bring their iPhones over to T-Mobile will be able to sign up for T-Mobile’s unlimited voice, text and data plan that was reintroduced last week at a monthly rate of $70. T-Mobile will also offer $100 gift cards in select markets to customers who sign a two-year contract. Although download speeds on the T-Mobile network are much slower than those currently offered by AT&T, Thomas emphasized that his company is in the process of completing 4G network upgrades that will provide iPhone customers with data speeds that meet or exceed those of AT&T.