Mobile Phone Plan Finder: Which UK Plan Is Right for You and How Much Should You Pay?

At Savzz, we round up working discount codes across hundreds of UK retailers, including mobile networks, SIM providers, phone retailers, and eSIM services. Mobile phone bills are one of the most overpaid household expenses in the UK. Most people are on the wrong plan for their actual usage, paying for data they do not use or locked into contracts that made sense two years ago but not any more.

This guide and the free plan finder tool below will help you work out exactly which type of plan suits your situation, what you should expect to pay per month, and how to find the best deal before you sign up.

Who Is This Guide For?

This tool and guide is useful for anyone who pays a mobile phone bill in the UK, but it is especially helpful if you are:

• Paying more than £25 per month on a SIM-only plan and not sure whether you are getting good value for your data allowance
• Coming to the end of a contract and trying to decide whether to renew, switch, or go SIM-only
• Buying a phone for the first time and not sure whether a contract, a SIM-only deal, or a refurbished handset is the right choice
• An older person or someone who does not use much data and wants to find the cheapest possible plan without paying for things they do not need
• Someone who travels abroad regularly and wants to stop paying roaming charges every time they leave the UK
• A parent setting up a plan for a child or teenager and wanting to understand the options clearly before committing to a contract

Who Is This Guide Not Suitable For?

• Business mobile buyers. Business tariffs, multi-device plans, and corporate contracts involve different pricing structures and VAT reclaim considerations. This guide covers personal consumer plans only.
• Anyone already locked into a contract with time remaining. The plan finder shows you what you should be on next. If you have months left on a current contract, check your exit fees before switching and factor those into any saving calculation.
• Anyone looking for a landline or broadband bundle recommendation. This guide covers mobile plans only. Broadband and home phone bundles are a separate comparison entirely.

How Much Should You Be Paying for a Mobile Plan in the UK?

According to Ofcom, the average UK adult pays around £20 to £25 per month for their mobile plan. Many people pay more than this without realising it because their contract automatically renewed at a higher price, or because they are still on an old plan that has not kept up with how competitive the market has become.

Here is a rough guide to what different plan types should cost in 2026:

Under 5GB SIM-only, rolling monthly: £5 to £10 per month. If you are paying more than this for a small data plan with no handset, you are overpaying.

10GB to 20GB SIM-only, 12-month contract: £8 to £16 per month. This is the sweet spot for most moderate data users.

Unlimited data SIM-only, 12-month contract: £15 to £28 per month. Several major UK networks offer unlimited data in this range. If you are paying more than £28 for an unlimited SIM-only plan, you are almost certainly paying too much.

New phone on a 24-month contract: £25 to £65 per month depending on the handset. The key is to compare the total contract cost against buying the phone outright plus a SIM-only plan.

How to Use the Mobile Phone Plan Finder

Answer four questions about your phone situation, how much data you use per month, how you feel about contract length, and what matters most to you.

The tool gives you a personalised plan recommendation with the expected monthly cost range, your estimated annual cost, how that compares to the UK average, an explanation of why that plan type suits you, what to look for when comparing deals, and what to watch out for.

Check your actual data usage before you start. On an iPhone go to Settings, Mobile Data, and scroll down to see your usage over the current period. On Android go to Settings, Network, and Data Usage. Knowing your real number rather than guessing makes the recommendation much more accurate.

SIM-Only vs Contract: Which Is Actually Cheaper?

This is the question most people get wrong when buying a mobile plan. The answer is almost always that SIM-only is cheaper over time, but the upfront cost of a new handset puts many people off.

Here is a straightforward comparison using a mid-range phone as an example:

A new phone on a 24-month contract at £35 per month costs £840 over the full term. The same phone bought SIM-free costs around £400 to £500. Paired with a 15GB SIM-only plan at £12 per month over 24 months that is £288 in SIM costs, bringing the total to £688 to £788. The SIM-only route saves £50 to £150 over two years even after buying the phone outright.

On flagship phones the saving is larger. A new iPhone 16 on a contract at £55 per month over 24 months costs £1,320. The same phone bought SIM-free costs around £799. Paired with an unlimited SIM at £20 per month over 24 months that is £480 in SIM costs, bringing the total to £1,279. Similar overall cost but with much more flexibility, the SIM-only plan can be cancelled any time after the phone is paid for.

The contract route makes sense when you cannot afford the upfront cost of the handset, or when the network is running a promotion that makes the total contract cost genuinely lower than buying separately.

What Is a SIM-Only Plan and Why Is It Often the Best Value?

A SIM-only plan is a mobile plan where you bring your own phone. You get a SIM card with a data, calls, and texts allowance and pay a monthly fee without any handset cost included.

SIM-only plans are cheaper than contract plans because you are only paying for the service, not the hardware. They are available on rolling monthly contracts with no minimum term, or on 12-month contracts with a slightly lower monthly price.

They work on any unlocked phone or any phone tied to the same network. If your phone is locked to a specific network, you can ask that network to unlock it for free once your original contract has ended, this is a legal right under Ofcom rules.

Should I Buy a Refurbished Phone?

Buying a refurbished phone is one of the best ways to save money on a smartphone without giving up quality. A refurbished phone is a used device that has been cleaned, tested, repaired where needed, and graded before being resold.

The grading system used by most UK retailers works as follows:

Grade A or Excellent: Looks and performs like new. Minor cosmetic marks that are hard to see in normal use. Battery health typically above 85%. This is what most people should aim for.

Grade B or Good: Light scratches or scuffs visible on close inspection. Fully functional. Battery health typically above 80%. Good value if you use a case.

Grade C or Fair: Noticeable marks or scratches. Fully functional but cosmetically worn. Best for buyers who prioritise function over appearance.

For most buyers, a Grade A refurbished iPhone or Samsung Galaxy from a reputable UK retailer with a 12-month warranty is a very good option. The saving versus buying new is typically 30% to 50% on the same model. Pair it with a SIM-only plan and your total monthly outgoing drops well below the cost of a new phone on contract.

The one thing to always check is battery health. Ask for the percentage before buying. Anything above 85% is healthy. Below 80% means you may need a battery replacement within a year, which costs around £50 to £80 at most repair shops.

What Is an eSIM and Do You Need One?

An eSIM is a digital SIM card built into your phone that works without a physical SIM card slot. Instead of swapping physical SIMs when you travel, you download a digital profile for a local network in minutes.

Most modern smartphones support eSIMs including all iPhones from the XS onwards and most Android flagships from 2020 onwards. Some recent iPhone models in the US market are eSIM only with no physical SIM slot, though UK models still include both.

For most UK users on a single network, eSIM versus physical SIM makes very little practical difference day to day. Where eSIM becomes very useful is for travellers. Instead of paying your UK network’s roaming charges, you can buy a local data eSIM for your destination country before you even board the plane, activate it digitally, and use local data rates without touching your UK plan.

Travel eSIM providers typically charge £5 to £20 for a week of data in most European countries, versus roaming charges that can reach £3 to £10 per GB on some UK plans.

How to Check If Your Phone Is Unlocked

An unlocked phone works with any UK network’s SIM. A locked phone only works with the network it was originally bought from.

To check whether your phone is unlocked, insert a SIM from a different network. If it works and shows signal, the phone is unlocked. If it says no service, invalid SIM, or asks for an unlock code, it is locked.

If your phone is locked and your original contract has ended, you can request an unlock from your network for free. Under Ofcom rules, UK networks must unlock phones for free. The process usually takes 24 to 72 hours and is done online or by calling the network.

Unlocking your phone before switching to a new network or buying a new SIM is an important step that many people miss, and it costs nothing.

How to Switch Mobile Networks Without Losing Your Number

Keeping your existing mobile number when switching networks is simple in the UK. The process is called porting and uses a PAC code, which stands for Porting Authorisation Code.

To get your PAC code, text PAC to 65075 from your current mobile number. You will receive the code within 60 seconds by text. Give that code to your new network when signing up. Your number transfers within one working day. You stay connected on your old network until the transfer is complete.

You do not need to contact your current network first or give any notice. The Text-to-Switch service handled by Ofcom makes the process automatic. Your current contract ends the day your number transfers.

If you want to leave your number behind and start fresh with a new number, text STAC to 75075 instead. This gives you a Service Transfer Authorisation Code that lets you cancel your current plan without porting your number.

Family Plans and Multi-SIM Deals: Are They Worth It?

Quite a few UK networks offer family plans or multi-SIM discounts that reduce the monthly cost per line when you have two or more connections on the same account.

For households with two or more people all using the same network, the saving per person can be £2 to £8 per month depending on the deal. Over a year across four people that is a saving of £96 to £384 compared to four separate individual plans.

The trade-off is that everyone on the plan is tied to the same network, which may not have the best coverage or data deal for every person’s individual situation. It also means one person typically manages the whole account and is responsible for the full bill.

Family plans are best suited to households where everyone lives in the same area, uses similar data amounts, and is happy on the same network long term.

Student Mobile Deals: What to Look For

Most major UK networks offer student discounts verified through UNiDAYS or Student Beans. These typically give 10% to 20% off the standard monthly price on SIM-only plans.

For students, a SIM-only rolling monthly plan in the 10GB to 20GB range is usually the best fit. Students tend to use Wi-Fi heavily on campus and at home, so very high data allowances are often unnecessary. The rolling monthly format means you can switch or cancel at the end of each term without penalty if your circumstances change.

Some networks also offer student cashback deals where a portion of your monthly bill comes back to you over the contract term. These are worth comparing against a straight discount to see which gives the better total saving over the year.

Tips for Finding the Best Mobile Deal Right Now

• Check your actual data usage before comparing. Most people overestimate how much data they use and end up paying for a higher allowance than they need. Check your phone settings for your real monthly average.
• Compare on Ofcom-regulated comparison sites. Ofcom accredits comparison websites for mobile plans, which means the data is verified and up to date. Use these alongside Savzz for a full picture.
• Look for discount codes before signing up. Many mobile networks and phone retailers offer promo codes that reduce the monthly cost or add extra data. Check our SIM card and eSIM discount codes and mobile phone discount codes pages before committing to any plan.
• Time your switch well. Networks often run their best promotions in January, around Black Friday, and at the start of the academic year in September. Signing up during these windows regularly gets you a better deal than signing up mid-month at standard pricing.
• Do not auto-renew without checking. When your contract ends, your network will usually contact you with a renewal offer. This is almost never the best deal available. Use that moment to compare the market and switch if something better exists.
• Check coverage at your home address before switching. Every major UK network publishes a coverage checker on their website. Check your home postcode, your workplace, and anywhere you regularly travel before committing to a new network.

The Smarter Way to Switch: Use the Finder, Then Find a Code

The plan finder above gives you the right type of plan for your situation. The next step is making sure you are not paying full price for it. At Savzz we round up working discount codes for mobile networks, SIM providers, phone retailers, and eSIM services across the UK.

Browse our mobile phone promo codes and our SIM and eSIM deals for current offers before you sign up to anything. A working code on a 12-month plan saves you money every single month for the full contract term.

Frequently Asked Questions

Which mobile plan is cheapest in the UK right now?

The cheapest SIM-only plans in the UK in 2026 start from around £5 per month for 1GB to 5GB of data on a rolling monthly contract. Several smaller networks and virtual operators offer plans in this range. The cheapest unlimited data SIM-only plans start from around £15 per month on a 12-month contract.

Use the plan finder above to see what the right price range is for your specific data usage and contract preference.

Is it worth switching to a SIM-only plan?

For most people, yes. If your handset contract has ended and you are still paying the same monthly amount, you are paying for a phone you have already paid off. Switching to a SIM-only plan at your data level typically cuts the monthly bill by £10 to £25. Over a year that is £120 to £300 saved on the same or similar service.

How do I know how much data I need?

Check your current usage in your phone settings. On iPhone go to Settings then Mobile Data. On Android go to Settings then Network and Internet then Data Usage. Look at your monthly average over the last three months for a realistic figure. Add a small buffer of around 20% extra as a comfortable allowance. Most people use between 5GB and 20GB per month.

What is the difference between a SIM and an eSIM?

A SIM is a small physical card you insert into your phone. An eSIM is a digital version built into the phone that is activated by downloading a profile rather than inserting a card. Both give you the same mobile service. eSIM is most useful for travellers who want to switch between their home plan and a local travel plan without swapping physical cards.

Can I keep my phone number when I switch networks?

Yes. Text PAC to 65075 from your current number to get your Porting Authorisation Code. Give that code to your new network when signing up. Your number transfers within one working day. You do not need to contact your current network or give any notice beforehand.

Is a refurbished phone as good as a new one?

A Grade A refurbished phone from a reputable UK retailer looks and works like new in normal use. The main differences are that it may have minor marks that are hard to see, it comes in plain packaging rather than the original box, and the battery health may be slightly lower than a brand new device.

For most people the saving of 30% to 50% versus buying new is well worth those trade-offs, especially with a 12-month warranty included.

Who built this plan finder?

The Savzz Mobile Phone Plan Finder was built by the team at Savzz.co.uk, a UK discount code and money-saving site. We built it because most mobile comparison tools push you towards specific networks based on commission rather than giving you a genuinely useful recommendation for your situation.

This tool is brand-agnostic, it recommends a plan type and price range rather than a specific provider, so the advice stays useful regardless of which deals are live at any given time. It is completely free with no sign-up required.