A SIM-only plan pays for mobile service. A handset-inclusive contract also funds or bundles a phone. SIM-only is not automatically the cheaper overall route, but it makes the service cost easier to see and usually gives more freedom over the device.
What you are comparing
| Feature | SIM-only | Handset-inclusive |
|---|---|---|
| Phone | You already own or obtain it separately | Included through the package or linked device plan |
| Upfront cost | Can be high if buying a phone | Often lower, but not always zero |
| Term | May be rolling, short or fixed | Often longer; device and airtime terms may differ |
| Price transparency | Service price is easier to isolate | Phone and service can be harder to separate |
| Switching flexibility | Usually greater after any SIM minimum term | Airtime and device commitments may remain |
Calculate both routes over one period
For SIM-only:
phone purchase or finance total + all SIM payments + scheduled rises.
For handset-inclusive:
upfront payment + all contract payments + scheduled rises + compulsory final payment.
Use the same data allowance and the same time period. If the SIM-only contract is 12 months and the device comparison is 24 months, include a realistic service cost for months 13–24 rather than stopping the calculation early.
SIM-only may suit you when
- your current phone remains secure and usable;
- you want to buy a previous-generation or refurbished model separately;
- you prefer short commitments;
- you may change network after checking coverage;
- you want the device cost and service cost to remain visible.
A handset-inclusive contract may suit you when
- the full total is competitive;
- the regular payment is safer than a large upfront purchase;
- the network meets your coverage needs;
- the contract summary clearly shows rises and cancellation;
- you understand when ownership passes and what remains due after an early exit.
Watch for false comparisons
- A SIM-only deal with too little data compared with the handset contract.
- A contract that includes a more expensive storage variant.
- A promotional SIM price that rises after a few months.
- A handset contract with conditional cashback counted as guaranteed.
- A SIM-only route funded by expensive unrelated borrowing.
Coverage comes before allowance size
Do not pay for a large allowance on a network that performs poorly at home, work or regular travel locations. Check the provider’s coverage information and, where practical, test service before a long commitment.
Rolling and fixed SIM-only plans are different
A monthly SIM-only label can describe a rolling arrangement or a longer minimum term. Compare flexibility, notice, scheduled rises and discounts. A low promotional rate on a long SIM contract may be less flexible than it first appears.
Using your existing phone is often the decisive option
The strongest SIM-only comparison may not involve buying another handset at all. Check whether your current phone still has adequate battery health, storage, repairability and security support. Extending a suitable phone’s life can avoid both a new device cost and unnecessary depreciation.
Separate finance can recreate a long commitment
Buying a phone through separate finance and adding SIM-only can provide clearer pricing, but it does not remove the device commitment. Combine both totals and record both end dates. Network flexibility is valuable only if the phone is compatible and the finance remains affordable.
Do not overbuy data to justify the contract
Review actual usage rather than choosing a larger allowance because it makes the handset package look generous. Unused data has no cash value unless the plan has a feature you will genuinely use.
Run the two-scenario comparison
Build two totals on paper. If one route is cheaper by only a small amount, choose the one with the safer cash flow and better flexibility. See Buying a Phone Outright vs on Contract for the device decision and How to Compare Phone Deals Correctly for a reusable method.
Sources and fact-checking
Facts checked: 25 July 2026.
