You typically buy both iPhones on a monthly installment plan (e.g., 24 or 36 months).

While some BOGO deals don't require a trade-in, many "Free iPhone" offers now rely on trading in an old device to get the maximum credit. 3. Best Times to Find Deals

Getting a "Buy One, Get One Free" (BOGO) iPhone deal usually involves specific carrier requirements rather than a simple retail giveaway. These offers are primarily designed to attract new customers or encourage existing ones to add more lines to their accounts.