A phone payment is affordable only if you can carry it through the full term without sacrificing essentials, relying on expected overtime or assuming a trade-in value that has not been confirmed. Provider approval is not a substitute for this household test.
Calculate the real monthly commitment
| Cost | Include |
|---|---|
| Device | Deposit, instalments, interest, fees and final payment |
| Mobile service | Airtime price and all scheduled rises during the term |
| Required extras | Mandatory delivery, connection or other unavoidable charges |
| Optional protection | Insurance premium, excess exposure, case and screen protection |
| Likely ownership | Repair provision and accessories you genuinely need |
| Existing commitments | Any old device balance or overlapping service |
Keep trade-in and resale value below the total rather than subtracting them as guaranteed money. They depend on future condition and market demand.
Use a three-stage affordability test
1. Current budget
Review at least three months of actual spending. Start with income received, then deduct housing, utilities, food, transport, childcare, debt payments and other essentials. Include annual costs by dividing them into a monthly provision.
2. Stress test
Repeat the calculation under less comfortable conditions:
- a higher airtime price after a scheduled rise;
- one month with lower variable income;
- an urgent household expense;
- insurance excess or repair cost;
- overlap while switching or settling an old device plan.
3. Exit test
Ask what it costs if you need to leave early. Device finance may continue after airtime ends, and selling the phone may not cover the settlement. Obtain the actual settlement and cancellation terms rather than assuming you can simply hand the phone back.
Illustrative affordability comparison
Illustrative figures only — not a recommended spending level.
| Route | Normal monthly cost | Stress-month cost | Observation |
|---|---|---|---|
| Premium phone finance plus airtime | £58 | £66 after rise and insurance | Long commitment with little room for change |
| Mid-range phone plus SIM-only | £31 | £36 | Lower total and easier replacement reserve |
| Existing phone after £90 battery repair | £14 airtime plus £7.50 monthly repair provision over 12 months | £22 | May be strongest if support and condition remain adequate |
Warning signs that the payment is not comfortably affordable
- You need a future bonus, trade-in or refund to meet ordinary instalments.
- The payment uses most of the money left after essentials.
- You are extending the term solely to make the monthly number acceptable.
- You cannot describe the total amount payable.
- You would have no reserve for a repair, excess or household emergency.
- You are replacing a working phone mainly because finance was approved.
Lower-cost alternatives
Compare a previous-generation model, a verified refurbished phone, a simpler new handset, outright purchase after saving, or keeping the present phone. The tight-budget guide focuses on preserving reliability rather than merely finding the lowest sticker price.
If you are already struggling with repayments, do not take replacement credit simply to cover the problem. Contact the provider and seek free debt guidance.
Related guidance: Phone Deals and Contracts links this topic to the next practical step. Use the Phone Contract Cost Guide for the complete end-to-end decision.
Sources and date checked
Last fact-checked: 25 July 2026. Provider terms, product ranges and interfaces can change. Check the documents offered for your own account before acting.
