fernwick
Independent · United Kingdom mobile networks · guidance only
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Advisory note AN-09

Phone contracts

How handset agreements are built, the single sum that settles any proposal, and the month in which most people begin overpaying.

Note AN-09 · five sections · reviewed July 2026 · no prices published

Independent status. fernwick is an independent guidance and information service. We are not a mobile network. We are not affiliated with, endorsed by, appointed by or connected to Three, EE, O2, Vodafone, Sky Mobile, Tesco Mobile or any other provider, and we hold no commercial arrangement with any of them. We do not sell, supply, arrange or broker SIM cards, contracts, handsets or services of any kind, and we take no commission. Everything published here is general information and must not be relied upon in place of the provider's own current terms.
Our position in one line

Every handset offer reduces to upfront plus monthly times months — and the most expensive month of any agreement is the first one after it ends.

§1The three routes

RouteWhat it means
Combined bundleHandset and airtime as one monthly figure. Used by most providers. Does not reduce at term end.
Split contractDevice credit and airtime billed separately. Used by O2 and Sky Mobile. The device half ends at repayment.
Outright plus a SIMHandset bought in full, airtime bought separately. Usually the lowest total, and the benchmark either way.

A credit check applies to any monthly device agreement. SIM-only and prepaid stay light in that respect.

If any of this is unclear

Telephone the advisory and we will talk it through. There is nothing to buy at any point.

020 3896 5248This line is for guidance and information only. We sell nothing, arrange nothing and act for no provider. If anything on this page is unclear, telephone and we will explain it.

§2The sum that settles it

Upfront payment plus monthly charge multiplied by months, across the whole term. Then set that against the same handset bought outright plus the cheapest suitable SIM over the same period. The smaller figure wins.

Cost slides between the upfront and the monthly like a see-saw, which is exactly why two shops can present entirely different structures for one handset and both call theirs the cheapest.

Common pitfallBundled earbuds, watches and speakers count at what you could actually sell them for, not at the advertised value. A bundle that only wins because of an accessory you would not have bought has not won.

§3The end of the term

On a combined bundle the monthly figure does not fall when the minimum term ends. Device money keeps being collected on a handset you already own outright, indefinitely, until you do something about it.

On a split contract the device half genuinely stops — but the airtime half continues at the same rate until you reduce it.

Diary the end date on the day you sign, with a reminder a month before it.
On arrival, do one of three things within days: move to SIM-only, upgrade deliberately after testing the sum, or leave.
If you upgrade, treat the offer exactly as a stranger's — it is a brand-new contract restarting the clock.
Check the app first: genuine offers appear inside your account, which is how you test whether any caller is real.

§4Trade-in, delivery and returns

MatterWhat to know
Trade-inQuotes swing with condition, storage and season. Take two — the maker's programme and one independent recycler.
Before sendingErase the handset, unlink accounts, and photograph it in case of dispute.
Next-day deliveryNeeds your exact model in stock and an order before the cut-off, usually mid-afternoon.
CollectionOften faster where a nearby branch holds the exact variant.
Cooling-offOnline orders carry a period, commonly fourteen days — a free trial of handset and network together.

§5Using the returns window properly

  • Signal at home and at work, room by room — not just the doorstep.
  • Battery across several ordinary days rather than one charge cycle.
  • Camera, screen, and how the device actually sits in your hand.
  • Packaging and accessories kept complete until you have decided.

Speak to the advisory

Telephone the advisory and we will talk it through. There is nothing to buy at any point.

020 3896 5248This line is for guidance and information only. We sell nothing, arrange nothing and act for no provider. If anything on this page is unclear, telephone and we will explain it.
Independent status. fernwick is an independent guidance and information service. We are not a mobile network. We are not affiliated with, endorsed by, appointed by or connected to Three, EE, O2, Vodafone, Sky Mobile, Tesco Mobile or any other provider, and we hold no commercial arrangement with any of them. We do not sell, supply, arrange or broker SIM cards, contracts, handsets or services of any kind, and we take no commission. Everything published here is general information and must not be relied upon in place of the provider's own current terms.
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