SIM-only vs contract mobile plans in Singapore is a two-year sum, not a monthly one. A contract bundles a phone with a plan, usually locks you in for up to 24 months and charges more per month. A SIM-only plan costs less each month but you buy the phone yourself, or keep the one you have. Add the phone price, every monthly bill and any upfront fee over 24 months for both, and the cheaper choice is usually clear.
Below we work through two scenarios with hypothetical prices and set out the rules that protect you under a contract.
The short version: If you keep your phone for more than two years or already own one, SIM-only usually costs less in total. A contract can come close when you want a new phone anyway and the subsidy is large. Whatever you choose, read the Critical Information Summary, including the price after any promotion ends.
How We Compared SIM-Only and Contract Plans
We total everything paid over 24 months:
- Contract: upfront phone price + 24 monthly bills.
- SIM-only: phone price (if you buy one) + 24 monthly bills.
Prices are hypothetical and rounded to show the method; they are not quotes from any telco. Real prices change often, so plug in the current offers you are considering.
The Worked Maths Over 24 Months
Scenario A: you want the same new phone either way. Assume the phone costs S$1,200 to buy outright.
| Contract | SIM-only | |
|---|---|---|
| Phone upfront | $400 (subsidised) | $1,200 |
| Monthly plan | $60 | $20 |
| 24 months of bills | $1,440 | $480 |
| Two-year total | $1,840 | $1,680 |
SIM-only is $160 cheaper here. The contract’s $800 phone subsidy is more than paid back through the extra $40 a month (24 x $40 = $960).
Scenario B: you keep your current phone. The SIM-only total is just the bills: $480 over two years, against $1,840 for the contract with a new phone. The difference is the cost of the new phone and the higher plan.
When a contract can win: if the subsidy is large relative to the price gap. A $1,200 phone at $100 upfront on a $55 plan totals $1,420, against $1,680 for buying the phone and a $20 SIM-only plan. Run your own numbers; the answer depends entirely on the offer.
Paying for the phone with an instalment plan changes the cash flow, not the total, unless there are fees. Our comparison of BNPL vs credit card instalment plans shows how fees and late charges add up.
Your Rights Under a Mobile Contract
Singapore’s telecom rules, set by the Infocomm Media Development Authority (IMDA), give contract customers specific protections:
- 24-month cap. IMDA limits residential contract periods to no more than 24 months.
- Information before you sign. The telco must point out key charges, the standard price after any promotional price ends, excess usage charges, termination charges, the minimum contract period, and the terms after a free trial ends.
- A Critical Information Summary. For residential contracts longer than one month, the telco must give you this summary and the contract within five working days.
- No worse terms mid-contract. A telco must not change the terms of a fixed-term residential contract, including pricing, in a way that disadvantages you during the contract.
Early Termination Charges
IMDA’s advisory guidelines of November 2023 set out how early termination charges should work for contracts over three months:
- The charge must fall at least month by month as the contract runs.
- It must exclude costs the telco avoids by ending your service.
- It can never be higher than the sum of the monthly fees for the remaining months.
IMDA’s own example: on a 24-month plan with a $200 charge at the start, leaving at month 18 should cost no more than $50, less avoidable costs.
This matters when comparing: a contract’s exit cost shrinks over time, so the real lock-in is strongest in the first few months.
When Each Option Does Not Suit
- A contract may not suit someone who might move overseas, change jobs with a work phone, or want to switch to a cheaper plan before two years are up.
- SIM-only may not suit someone who cannot or does not want to pay for a phone upfront, or who values a bundled device and a single bill.
- Watch the end of the contract. Once the 24 months are up, you may still be paying a price set to recover a phone you have already paid off. That is the moment to compare again. Our year-end household money audit includes a telco check.
If Something Goes Wrong
Raise the problem with the telco first. If it is not resolved, the dispute scheme run by the Singapore Mediation Centre handles consumer disputes with telecom and media providers from the past year, up to S$10,000. Mediation costs S$10; a binding decision costs more. It does not cover streaming services or pricing and commercial decisions. Our guide to consumer rights in Singapore covers other routes.
What To Do Next
- Check your current contract end date and what you pay each month.
- For any new offer, total 24 months of costs, including the phone and any upfront fee.
- Read the Critical Information Summary for the price after the promotion ends and the termination charge.
- Put the monthly figure into our monthly budget planner and compare it with what you pay now.
