A smaller monthly payment does not always mean a cheaper phone. Write down the upfront payment, every regular payment and how long you must keep paying.
Put both options on the same timescale
Imagine a £300 phone with a £10 monthly SIM. Over 24 months that is £540 before delivery or changes in price. A deal costing £30 a month plus £50 upfront totals £770 over the same period. These are made-up examples, not offers.
Try your own figures in the total-cost calculator. Add delivery, compulsory fees and any announced price changes separately if they are not already included.
Check who owns the phone
Buying a phone, paying for it in instalments and hiring it are different arrangements. A hire agreement can require you to return the handset. Do not treat its monthly fee as the price of owning the phone.
Check what happens next
Find out when a promotional price ends, when the price can rise and what you pay after the initial contract. Keep the written offer. If a plan includes credit, read the provider’s full terms and decide whether the payments fit your budget.
Compare phone prices and SIM options before deciding.
Make room for a different billing cycle
For a 30-day plan, count the payments due over the period you want to compare. Do not simply call it a calendar-month price. Include the end of a discount, scheduled price changes and delivery once each.
Use the plan checklist before joining. If keeping your existing phone is an option, check its remaining software support too.
Reviewed 29 October 2026 · Here4Mobiles