Compare UK monthly SIM deals over the phone — not a form in sight.
Thornfield SIM is an independent mobile deals advisory service. Tell us how you use your phone and our team will talk you through monthly SIM-only plans across the UK's major networks, in plain English, with no obligation to buy.
What a call with us looks like
Example monthly SIM packages
These are indicative starting points from the current UK SIM-only market. Exact pricing, data allowances and available networks change frequently and depend on your postcode, credit position and any current offers — our team will confirm live pricing on the call.
- Around 5GB data
- Unlimited UK minutes & texts
- 30-day rolling contract
Good fit if you're mostly on Wi-Fi and use mobile data for messaging, maps and light browsing.
Ask about this plan- Around 25GB data
- Unlimited UK minutes & texts
- EU roaming allowance included on most networks
Suits streaming on the move, social media and regular navigation use.
Ask about this plan- Unlimited data on most networks
- Unlimited UK minutes & texts
- Options for tethering / personal hotspot
Aimed at heavy streamers, remote workers and anyone tethering a laptop regularly.
Ask about this planPrices shown are representative "from" figures based on typical UK SIM-only offers at time of writing and are not a quote from any specific network. Call our team for current pricing that matches your usage and location.
A short call usually beats an hour of tab-switching
SIM-only pricing shifts often, varies by postcode and coverage, and the "best deal" depends on things a web form rarely asks about — how much you actually use data, whether you roam, and what your current contract allows. We built Thornfield SIM around a phone call for that reason.
You call us
Ring 0330 059 9027 and tell us roughly how you use your phone — calls, data, streaming, roaming.
We compare live options
Our team checks current SIM-only pricing and coverage for your postcode across the networks we work with.
You decide, no pressure
We explain the trade-offs plainly. If nothing suits you, that's fine — there's no obligation to proceed.
Networks we compare against
We work across the UK's main mobile infrastructure providers and a range of SIM-only tariffs built on their networks. We don't represent any single network — our job is to compare, not to push one brand.
Frequently asked questions
Is Thornfield SIM a mobile network?
No. Thornfield SIM is an independent comparison and advisory service operated by Corvan Mobile. We don't own network infrastructure — we help you compare SIM-only monthly plans available in the UK market and can talk you through providers that suit your usage.
Does it cost anything to call?
Calls to 0330 059 9027 are charged at your standard UK landline or mobile rate — the same as calling any regular UK number. Check your own provider's rate for 03 numbers if you're unsure.
Will I be pushed into buying something?
No. We talk through options based on what you tell us. If none of the current deals suit you, you're free to end the call with no purchase and no follow-up obligation.
Can I switch and keep my number?
In most cases, yes — UK number porting (PAC/STAC transfer) is standard across networks. Our team can talk you through the process on the call.
How is Thornfield SIM funded?
We may receive a referral commission from certain providers when a call results in a new plan being taken out. This doesn't change the price you pay and doesn't affect the advice we give — see our About Us page for more detail.
Ready to compare your options?
One call, a few honest questions about how you use your phone, and a clear answer — no forms, no spam follow-ups.
Call 0330 059 9027