Cheapest SIM-Only Plans in Singapore 2025

In the contemporary telecommunications landscape of Singapore, consumers are spoilt for choice. The rise of budget-friendly SIM-only plans—especially those offered by mobile virtual network operators (MVNOs)—has transformed the market, bringing unprecedented competition and value. These plans, typically contract-free and devoid of handset subsidies, enable users to tailor their mobile needs without long-term commitments.

This article delves into the most cost-effective SIM-only plans under S$20/month, explores standout offers, compares MVNOs against major telcos, examines network quality and nuances, and provides practical recommendations based on diverse consumer profiles.

Market Dynamics: MVNOs vs Major Telcos

Singapore’s telecom ecosystem is dominated by three primary network operators—Singtel, StarHub, and M1—collectively known as Mobile Network Operators (MNOs). MVNOs such as Circles.Life, Zero1, Zym Mobile, RedONE and others lease network infrastructure from these MNOs, delivering streamlined digital services with minimal operational overhead. The result is lower prices and more diverse plan options.

Industry analysts concur that the quality of service remains reliable; MVNOs leverage the same infrastructure as MNOs, ensuring no significant degradation in network performance .

Best SIM-Only Deals Under S$20/month

A. Sub-S$10 Steel-Cheap Plans

A battleground of value, the sub-S$10 tier has driven innovation. Several standout options include:

MVNO / MNO	Plan	Price	Data	Calls	SMS	Bonus
Zero1 Starter (Singtel network)	Unlimited-managed data (6 GB full-speed), 150 min, 100 SMS	S$7–9.90	≈ 100–∞ GB managed	150	100	4G & 5G
Eight Mobile (StarHub network)	228 GB local & MY roaming + APAC	S$8	228 GB	588	88	4G
Zym Mobile Lite 4G	20 GB, 400 min, 200 SMS, data rollover	S$10.10	20 GB	400	200	Rollover
VIVIFI Lite	3 GB, 500 min, 20 SMS	S$8.88	3 GB	500	20
Circles.Life S$5 plan	2 GB, 50 min, 25 SMS	S$5	2 GB	50	25
VivoBee	1 GB, 50 min, 50 SMS	S$5	1 GB	50	50
RedONE	3 GB, unlimited local calls, 10 SMS	S$8	3 GB	Unlmtd	10

Notable Insights:

Zero1 offers “unlimited” data at managed speeds post first billed GB, combining freedom and clarity; the S$7 entry-point plan grants 100 GB before speed is throttled .
Eight, a StarHub MVNO, allows 228 GB across Singapore and Malaysia for S$8—an exceptional deal .
Circles.Life and VivoBee offer entry-level, no-frills 2 GB and 1 GB plans respectively at S$5, ideal for ultra-light users.

Reddit users concur: one noted, “$10 for 5G, 100 GB and 3 GB roaming is a damn good deal” referring to Zym’s S$10.10 100 GB offering

B. S$10–15 Sweet Spots

Between S$10 and S$15, plans deliver ample data and occasional perks:

Zym Mobile Lite expands to 100 GB at S$10.10, making 5G accessible to heavy users
SIMBA (formerly TPG): at S$10, offers 100 GB, unlimited SIMBA-to-SIMBA talk/SMS—powered by the same infrastructure as Zym
heya by Singtel: S$10 gives 100 GB, 300 min, 50 SMS
Geenet: S$10 buys 60 GB, 1 000 min, 100 SMS
MyRepublic 4G Lite: 10 GB + 300 min + 300 SMS for S$10
Circles.Life 4G Lite and GOMO (Singtel digital brand) both offer 10 GB + ~100 min + ~100 SMS for just over S$10

C. S$15–20 Plans: 5G, Rollover & Flexibility

In this tier, luxury features like 5G, high data caps, and rollover emerge:

M1 Maxx: S$12–18.95 offers 50–200 GB, with generous talk/SMS and streaming service vouchers
M1 Bespoke 150/200 GB True-5G: S$15.95–18.95, with 1 100 min/SMS and unlimited weekend data
StarHub Star Plan M: S$22 for 150 GB, 1 000 min, 500 SMS, plus 2 GB roaming to APAC .
MyRepublic 5G plans: S$19.95 delivers 110 GB 5G, 1 200 min/SMS; S$29.95 unlocks unlimited/capped daily speed.
Circles.Life email offer: exclusive promo delivering 750 GB + unlimited calls for S$8; limited-time code CR84750GBCWB

Network Performance & Service Nuances

Network Reliability

MVNOs lease from MNOs, so network stability mirrors the underlying operator. Zym, Circles.Life, and Zero1 benefit from Singtel or M1’s robust coverage . One Reddit user notes Zym’s service is strong “unless the MRT is really crowded” .

Rollover & Roaming Benefits

Many plans include rollover (e.g. Zym Mobile), offering greater flexibility .
Cross-border roaming allowances (Malaysia, APAC) are often bundled, notably with Eight, Zym, and SIMBA .

Call & SMS Provisions

While heavier data plans sometimes limit calls/SMS, MVNOs such as RedONE and Zero1 offer generous voice options, and SIMBA can provide unlimited intra-brand voice/SMS .

Customer Support

Being digital-first, MVNOs typically offer app/chat-based support. Reddit remarks: “GOMO takes 3 to 4 hours to respond to live chat; Eight emails take 2–3 working days” . Those valuing swift resolution or face-to-face support might lean towards MNOs.

Major Telcos: Extra Value or Overpaying?

The three MNOs—Singtel (via GOMO), StarHub, and M1—offer robust plans with extras, albeit at slightly premium prices:

GOMO by Singtel: From S$14.33, plan includes 300 GB 5G, 800 min/SMS, 10 GB APAC roaming .
StarHub: S$22 “Star Plan M” (150 GB, 1 000 min, 500 SMS, roaming) delivers value; S$32 upgrades the data cap .
M1: Bespoke plans allow customiseable data and call packages; 150 GB 5G for S$15.95; 200 GB for S$18.95 .

Distilling the Differences

Provider	Price (local)	Data	Extras
MVNOs	S$5–12	2 GB to 100 GB+	Rollover, roaming, low-cost
GOMO	S$14.33	300 GB	5G, network reliability
StarHub	S$22	150 GB	Roaming, voice/SMS
M1 Bespoke	S$15.95–18.95	150–200 GB	Flexibility, weekend perks

While MVNOs lead in pricing, MNOs deliver unmatched data volume and more traditional support channels.

Choosing the Right Plan – A Consumer Guide

To navigate this tiered ecosystem, it helps to align plan strengths with user priorities.

a) Budget-conscious Minimalist (≤ S$10)

Circles.Life S$5 – 2 GB, basic voice/SMS; ideal for light users.
Zero1 S$7 – ~100 GB managed data; excellent value for flexible data users.
Eight S$8 – 228 GB across Singapore + Malaysia; superb for occasional travellers or high-data users.

b) Balanced Data & Voice (S$10–15)

Zym Mobile S$10.10 – 100 GB, full voice/SMS, rollover, and some 5G.
SIMBA S$10 – 100 GB + unlimited SIMBA calls; suitable for staying within the ecosystem.
heya/Geenet/MyRepublic/Circles.Life – 10–60 GB with moderate voice/SMS; good for average use.

c) Heavy Data & 5G Users (S$15–20+)

M1 150 GB True-5G (S$15.95) – Excellent value for premium services.
M1 200 GB plan (S$18.95) – Configurable and rich in perks.
StarHub Star Plan M (S$22) – Broad coverage, roaming, and high call/SMS allowances.

d) Data Gluttons & Promotional Seizers

Circles.Life promo – 750 GB + unlimited voice for S$8 with specific email code .
MyRepublic’s 5G Unlimited – S$25.90–29.95 offers daily full-speed data caps and massive voice/SMS bundles .

Final Recommendations

For minimal use: Circles.Life, VivoBee — S$5 models provide essential connectivity.
For data value + roaming: Eight’s S$8 plan stands unmatched with 228 GB local + Malaysia.
For robust usage on a budget: Zym Mobile S$10.10 unlocks 100 GB, 5G and rollover.
For flexible premium services: M1’s 150 GB plan (S$15.95) or StarHub’s S$22 offering represent great mid-range MNO options.
Watch for flash deals: MVNOs frequently launch email-only or promo codes that can dramatically outclass MNO prices.

Broader Considerations

Simplicity vs. Supervision

MVNOs emphasise simplicity and digital-first service, which suits tech-savvy individuals. However, slower support response times may frustrate others.

Contract Flexibility

Almost all MVNOs offer zero-contract plans; some MNOs like M1 also provide month-to-month options. The freedom to switch without legacy handsets is a key advantage.

Network Quality

Network performance depends largely on MNO infrastructure. For consistent access, especially in transit hubs or deep indoors, providers on Singtel (Zero1, Zym, SIMBA, GOMO) or M1 (Circles.Life) networks are recommended.

Conclusion

Cheapest SIM-Only Plans in Singapore 2025

The SIM-only market in Singapore in 2025 offers unparalleled choice for consumers of every stripe—from budget birds to data-hungry power users. MVNOs are driving the pricing revolution, offering plans from just S$5 to generous captures of value around S$10–15. MNOs remain relevant for those willing to pay slightly more in exchange for higher data volumes, 5G, and traditional support.

Ultimately, the best plan depends on your usage pattern:

For frugal functionality, pick Circles.Life or VivoBee.
For data-first travellers, Eight or Zym stand out.
For power users or minimal-switchers, M1’s True-5G or StarHub’s Star Plans excel.

In this dynamic market, flexibility reigns. With competitive pricing, contract-free terms, and promotional waves, users should reassess their plan annually—or even monthly—to ensure optimal savings and services.