Phone buying guide
When a phone deal requires a more expensive carrier plan
Calculate the service-price difference before treating bill credits as savings.
Separate device and service
A promotion can reduce device payments while requiring a premium plan. Calculate the monthly plan difference against the service you would otherwise choose, multiplied across the entire required period.
Household discounts, taxes, autopay rules, activation charges, and line requirements belong in the scenario rather than in fine print.
Model an early exit
If credits stop after cancellation or plan change, calculate the phone balance and lost future credits at several exit dates. A nominally free phone can create a large switching cost.
Also check payoff and unlock rules. Owning the remaining balance and receiving promotional credits are separate contractual questions.
Choose the bundle intentionally
The deal can be valuable when the qualifying plan already fits the household and the carrier relationship is likely to last. It is weaker when service is upgraded only to unlock device credits.
Compare total service and device spending—not the phone line item—against an unlocked cash purchase on a suitable lower-cost plan.
Editorially reviewed: July 20, 2026