Carrier adverts often promise a new phone for a big discount, or even free. These offers can be good value, but they usually come with conditions. Understanding how the discount is delivered, and what you need to do to keep it, helps you decide whether a deal is right for you.
This guide explains the common pieces of a US phone deal. It is written as of October 2026. Offers change frequently, and we never make up prices, so check the current price and full terms on the carrier's website before you commit.
How phone deals are usually structured
A typical carrier phone deal combines a few elements:
- The phone's full price. This is the starting point.
- Financing. The full price is often split into monthly payments over a set number of months.
- Bill credits. The discount is usually applied as a monthly credit on your bill over the same period, rather than as an upfront price cut.
- Conditions. You may need a particular plan, a new line, a trade in or to stay for the full period to get the whole discount.
Bill credits explained
With bill credits, the carrier reduces your monthly bill by a set amount for each month of the financing period. If you stay for the full period, the credits add up to the advertised discount.
The important point is what happens if you leave early or pay off the phone early. With many deals, the remaining credits stop. You would then owe the remaining balance on the phone, without the discount you were expecting. Always check:
- How many months the credits last.
- What happens to the credits if you switch plans, cancel a line or leave the carrier.
- Whether you must keep a specific plan for the whole period.
Trade ins explained
A trade in means giving your old phone to the carrier in exchange for credit toward a new one. The value can depend on:
- The phone model and storage size.
- Its condition, such as screen cracks or battery issues.
- Whether it is fully paid off and unlocked, if required.
- The plan you choose and whether you are a new or existing customer.
Some trade in offers are applied as bill credits over time rather than as an immediate discount. That means the same rules about leaving early may apply.
Tips for trading in
- Read the condition requirements carefully before you send your phone.
- Back up your data, sign out of your accounts and reset the phone.
- Keep proof of shipping or a receipt if you hand it in at a store.
- Check your bill in the following months to make sure the credit appears as promised.
- Compare the trade in value with what you might get by selling the phone elsewhere.
Financing explained
Financing splits the cost of the phone into monthly payments. In many cases the carrier finances the phone itself. Things to check:
- Length of the agreement. Longer agreements mean lower monthly payments but a longer commitment.
- Credit check. Financing may require one.
- Down payment. Some deals require money upfront.
- Interest. Many carrier financing deals are interest free, but confirm this for your specific deal.
- Unlocking. Phones on a financing plan may stay locked to the carrier until certain conditions are met. Read the carrier's unlocking policy.
Free phone offers
When a phone is advertised as free, it usually means the bill credits cover the full price of the phone over the financing period. You still sign a financing agreement, and you may need a particular plan or a trade in. If you leave early, you may owe the remaining balance.
Free can still be a good deal, but compare the total cost of the plan you need to take. A more expensive plan over many months can outweigh the value of the phone discount.
Working out the real cost
To compare deals fairly, add up what you would pay over the full period:
| Item | Deal A | Deal B |
|---|---|---|
| Monthly plan cost | Check current price | Check current price |
| Monthly phone payment | Check current price | Check current price |
| Monthly bill credit | Check current terms | Check current terms |
| Upfront costs and fees | Check current price | Check current price |
| Months in agreement | Check current terms | Check current terms |
Multiply the monthly figures by the number of months, add the upfront costs and compare the totals. Also ask yourself whether you would actually want this plan for the whole period.
Questions to ask before you sign
- Is the discount upfront or paid as bill credits?
- How many months does the agreement last?
- Do I need a specific plan, and what does it cost after any promotion ends?
- What happens if I leave or change plans early?
- When can the phone be unlocked?
- Are there activation, upgrade or other fees?
Read the fine print, then decide
Phone deals are not tricks, but they are designed with conditions. If you plan to stay with a carrier for the full period and the plan suits you, a deal can offer real value. If you might want to switch soon, buying an unlocked phone outright or keeping your current one could be simpler. Read the terms, check current prices directly with the carrier and choose with your eyes open.