You must purchase two eligible smartphones (typically from the same manufacturer) on an installment plan.
The "free" phone is not truly free upfront. You pay the monthly installment for both devices, and AT&T applies a monthly bill credit (often around $20–$25) over 24 to 36 months to offset the cost of the second phone.
AT&T ’s "Buy One Get One" (BOGO) offer for the Go to product viewer dialog for this item.
At least one of the lines usually needs to be a new activation.
