Mobile
iPhone 18 Pro Max: SIM-Free or Contract? How to Compare the Two
SIM-free means paying for the iPhone 18 Pro Max once and adding any SIM-only plan; a contract spreads the cost over the term with one network. Compare the two totals over the same 24 months, including the upfront payment and any stated rises.
- Compare over the same 24 months
- A contract involves a credit check
- An iPhone bought from Apple is unlocked
Apple's outright price and the contract options Wisemium lists, with each upfront payment and stated rise.
SIM-free or contract
- Paid on the day
- Handset price, or the upfront payment
- Each month
- SIM plan, or one contract price
- Tied to a network
- No, or for the whole term
How the two routes differ. Your own figures go in the calculator below.
Work out both totals over 24 months
Nothing you type here is sent anywhere or saved. General information, not financial advice.
The full guide
SIM-free means you buy the iPhone 18 Pro Max outright, unlocked, and add a SIM-only plan of your choice. A contract bundles the phone and the plan into one monthly price, normally for 24 months. SIM-free costs more on the day and gives you freedom to change plan; a contract spreads the cost and ties you to one network for the term. Which costs less depends on the prices on the day, so the comparison has to be done with current figures.
What each route involves
| Fact | SIM-free with SIM-only | Contract |
|---|---|---|
| Paid on the day | The full handset price | The upfront payment, which can be low |
| Monthly | The SIM-only plan | One price for handset and plan |
| Credit check | None for the handset; depends on the SIM-only plan | Normally yes |
| Tied to a network | Only for the SIM-only term, often 30 days or 12 months | For the full term |
| Price rises | Only on the SIM-only plan, if stated | On the whole monthly price, if stated |
| The phone is unlocked | Yes | Check with the seller |
How to compare the cost
- Take the outright price of the storage size you want.
- Add 24 months of a SIM-only plan with the data you would actually use.
- Take the contract: monthly price for each month of the term at the price that applies in that month, plus the upfront payment.
- Compare the two totals, then consider what the difference buys: spreading the cost, or the freedom to change plan.
The iPhone 18 Pro Max page sets out Apple's outright price for each storage size and the contract options in Wisemium's catalogue, each with its upfront payment and its stated price rises, with the date each figure was checked.
Who each route suits
- SIM-free suits someone who can pay for the handset now, wants to change plan freely, travels and uses local SIMs, or has a short UK credit history.
- A contract suits someone who wants to spread the cost, is content with one network for the term, and expects to pass the credit check.
If you are new to the UK
A handset contract involves a credit check, and a short UK credit history often leads to a decline whatever you can afford. SIM-free with a SIM-only plan does not involve handset finance. The guide below covers the options and how to avoid repeated applications.
Related
Phone contract when new to the UK
Credit checks, SIM-only and buying outright.
Read the guideWhat to check before financing an iPhone
Term, upfront cost, price rises and the total.
Read the guidePro or Pro Max?
What differs between the two and what does not.
Read the guideHow Wisemium helps
Wisemium lists the contract options in its catalogue for the iPhone 18 Pro Max beside Apple's outright price, and lists SIM-only plans separately, so both sides of the comparison are in one place. It does not list every provider. Once you have chosen, add the plan to Wisemium and it keeps the price and the end date on record.
Common questions
Is a SIM-free iPhone unlocked?
An iPhone bought outright from Apple is unlocked and works with any UK network's SIM.
Can I get a SIM-only plan on a rolling 30-day term?
Yes. Several UK providers offer 30-day SIM-only plans alongside 12-month ones. The shorter term usually costs a little more each month.
Does buying outright affect my credit file?
Paying in full involves no credit agreement. Paying by instalment finance does.
This is general information, not financial advice. Approval for any contract or finance is the seller's decision.
A SIM plan for a SIM-free phone
The SIM-only figure in the calculator above is one of these. O2's plans roll every 30 days; Mozillion's are paid once for the whole term.
120GB data
£12a monthNo upfront cost
- Virgin Media customers may be eligible for double data 120GB becomes 240GB for an eligible Virgin Media customer
Eligibility and terms
- Virgin Media customers may be eligible for double data. As stated by O2, 30 September 2026. O2 confirms eligibility; not every customer qualifies.
Opens O2’s site in a new tab.
250GB data
£15a monthNo upfront cost
View offerOpens O2’s site in a new tab.
150GB data
£132paid onceCovers 24 months · equivalent to £5.50/monthNothing more to pay for the plan during the 24 months
No mid-contract price rises (Mozillion)
View offerOpens Mozillion’s site in a new tab.
Wisemium may receive a commission if you click links on our site. This does not affect what you are shown or what you pay.
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