: Even for "free" devices, customers must pay taxes on the full retail price of both phones at the time of sale.
: Customers must pay the full monthly installment for the first few months until credits kick in; catch-up credits are then applied to the account. at&t buy one get one free deal
: While BOGO deals were powerful tools for adding new lines (acquisition), trade-ins allow AT&T to lock existing customers into new 36-month cycles (retention). Consumer Considerations & Pitfalls : Even for "free" devices, customers must pay