Advisory note AN-00Independent guidance on UK mobile networks
Nineteen advisory notes on the companies serving the United Kingdom, what each offers, what it costs to get wrong, and what to do at each stage.
Advisory current July 2026 · nineteen notes · nothing for sale · 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 lineAn independent advisory on United Kingdom mobile networks. We sell nothing, arrange nothing and act for no provider — we simply explain how the market works and what any given decision commits you to.
§1What this advisory is
We publish guidance on the mobile networks serving the United Kingdom: which companies operate here, when each arrived, what each actually offers, and what a customer should understand before joining, while served, and on leaving.
Everything is written as an advisory note with the same anatomy — our position in one line, the background, what is offered, what to verify, the common pitfalls, and the steps to take. Notes are referenced AN-01 to AN-19 so a point can be found and returned to.
- We sell nothing: no SIM cards, no contracts, no handsets, no services of any kind.
- We take no commission and accept no payment for placement, from anyone.
- We publish no prices — they expire faster than any site can correct them.
- We cannot see or alter any account you hold, and we will never ask for a password, a security code or payment details.
Prefer to start with a conversation?
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 operators
Four companies own mobile infrastructure in this country; every other brand rents capacity from one of them and resells identical radio waves.
§3The subjects
Twelve notes covering plans, payment, and the whole progression from joining to leaving.
AN-08SIM plansRolling or fixed, unlimited or measured, and how to size from evidence
AN-09Phone contractsCombined bundles, split contracts, and the month people begin overpaying
AN-10Pay as you goWho prepaid genuinely suits, and where the crossover sits
AN-11Monthly billsWhich figure is the price, and where money disappears quietly
AN-12Price changesFour foreseeable rises, five deliberate falls
AN-13JoiningCheck coverage first, price last — and four things on day one
AN-14LeavingTwo free texts, and the obligations owed to you
AN-15CoverageWhat maps show, and the only evidence that counts
AN-16RoamingEurope, fair-use ceilings, and the trap at sea
AN-17eSIMFree everywhere — and the fees that do not exist
AN-18Market historyHow the market took its present shape
AN-19Terms explainedEvery term, in plain words
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.