Phone Deals: Calculate the Cost Beyond the Free Price

The sticker says free. The bill tells a longer story.

Use one ledger. Put the phone payment, required plan, trade-in value, recurring credits, taxes, service fees, and exit cost on it. This is the same discipline behind a total-cost comparison for a Tesla Model Y: the low opening number is not the whole price.

Why is a phone advertised as free still expensive over time?

A phone advertised as free stays expensive when the offer trades an upfront discount for required service and a long stream of credits.

Start with the plan. AT&T says certain promotions require a qualifying unlimited plan. If that plan costs more than the plan you would otherwise buy, that difference belongs in the promotion's cost. Multiply the monthly difference by every month you intend to keep the offer. Do not count a plan you did not need as a free phone benefit.

Then read the credit schedule. Verizon says promotional credits are spread over the device-payment term and gives 36 months as its example and general guidance. Its illustrative BOGO example places two $799.99 phones on 36-month financing at about $44 per month in device charges before promotional credits, with taxes and service fees extra. Credits can take one or two billing cycles to appear, so the first bill can look worse than the final steady bill.

T-Mobile shows the other common pattern. In its $800-off example, a $400 trade-in applies immediately, while the remaining $400 becomes 24 monthly credits of $16.66. The immediate trade-in portion and the later credit portion are not interchangeable. The first reduces the purchase now. The second arrives only while eligibility continues.

Check the trade-in before assigning it full value. Verizon's trade-in terms say final value follows receipt and validation of the device's make, model, storage, carrier, and condition, including power status, battery damage, and cracked screens. A device that differs from its description, arrives more than 30 days after the order, is lost or stolen, or carries a device-payment balance can be ineligible under the listed terms. T-Mobile also requires a qualifying trade-in to be paid off, working, and free of Find My iPhone or Android anti-theft protection.

Do I lose bill credits if I pay off my phone early?

Yes. The carrier guidance provided by Verizon and T-Mobile says early payoff forfeits remaining promotional credits.

Verizon's promotion FAQ states that paying off the device agreement early ends the remaining monthly device promotional credits. It also lists early upgrade, cancellation of the promotional line, and a move to an ineligible plan as credit-ending events.

T-Mobile's recurring-credit guidance is equally direct: early payoff forfeits remaining Recurring Device Credits, and the customer pays the full remaining installment balance without subtracting future credits. Paying off the balance ends the financing obligation. It does not turn unearned credits into an instant rebate.

Before an early payoff, calculate two separate amounts: the balance still owed and the credits still scheduled. The first is what must be paid. The second is the discount being abandoned. If the goal is a new phone, add the cost of that next device as well. An upgrade can be cheap at checkout and costly across both unfinished promotions.

What happens to my phone promotion if I switch carriers?

Switching carriers normally ends future promotional credits and can make the remaining phone balance due at once.

T-Mobile says cancellation of service causes the loss of remaining Recurring Device Credits and makes all remaining Equipment Installment Plan balances due immediately. Verizon says cancelling a promotional line before the term ends forfeits remaining credits and requires payment of the remaining Device Payment Agreement balance.

AT&T's current eligibility guidance, last updated March 3, 2026, says a shopper who leaves a qualifying unlimited plan can return to a qualifying plan within 30 days of AT&T's notification to restore credits. If that does not happen, credits stop and the device balance becomes due. For a new-line offer, cancelling within 90 days stops smartphone credits; AT&T says reinstatement within 30 days of its notice can restore them.

Leaving does not mean the phone is unusable forever. The Federal Communications Commission says unlocked phones can work on compatible U.S. and international networks, giving customers more freedom to choose a better-priced plan or coverage. For eligible postpaid devices, participating CTIA carriers commit to unlock after the service contract or financing plan is fulfilled, or after an early-termination fee is paid. Compatibility remains a separate test.

The order matters. Settle the device obligation. Confirm unlock eligibility. Then compare service. A free phone is often a timed agreement wearing a price tag.