As of September 2023, AT&T offers phones like the Samsung Galaxy Z Flip5, Apple iPhone 14 Pro, Samsung Galaxy S23, and the Google Pixel 7 for free after 36 months of billing credit. Eligibility requires purchasing an eligible smartphone on a 36-month installment agreement, paying taxes on the full retail price upfront, a $35 activation/upgrade fee, and having an eligible unlimited plan. Additionally, a trade-in of an eligible smartphone in good working condition within 30 days of activation is required.