Guide to Singapore’s Best SIM-Only Plans (2025)

What Is a SIM-Only Plan and Why It Matters in 2025

A SIM-only mobile plan mobile plan provides you with voice, SMS, and data services without the bundled cost of a new handset. Unlike contract plans that lock you into 12- or 24-month commitments, SIM-only plans are contract-free, offering greater flexibility, better value, and lower monthly bills.

With mobile data usage surging due to streaming, gaming, and hybrid work, more Singaporeans are switching to SIM-only plans to match their digital lifestyles. Whether you're a student on a budget, a remote worker, or a  heavy mobile user, there's a plan to fit your needs and your wallet.

Best SIM-Only Plans in Singapore (2025 Overview)

Here’s a breakdown of the best sim only plan Singapore users can sign up for in 2025, based on value, data, features, and network strength:

Each plan has a niche—some focus on heavy data, others on low monthly cost, and some add perks like eSIM support, roaming, or access to tools like ChatGPT via Circles.Life.

Cheapest SIM-Only Mobile Plan in Singapore

If your priority is price, here are the most affordable options:

Zero1 leads for low-use users who want basic connectivity at under $10/month, while Giga and Circles.Life are great for those needing more data on a budget.

Best SIM-Only Plan for Light Data Users: Compare & Save

Light users typically consume under 30GB per month and mainly use WhatsApp, web browsing, and some social media.

Ideal for: Students, retirees, or secondary SIM users who don’t stream or game much but still want stable connectivity.

Best SIM-Only Plan for Moderate Data Users: Compare & Save

Moderate users typically stream music, use video calls, and social media regularly—requiring 60–100GB monthly.

Ideal for: Working professionals, hybrid workers, and social media users needing more robust coverage and voice/data balance.

Best SIM-Only Plan for Heavy Data Users: Compare & Save

If you're constantly streaming video, gaming, or tethering, choose a plan with 150GB+ and high-speed 5G support.

Ideal for: Power users, gamers, and anyone who wants top-tier speeds and the ability to use mobile data without limits.

Postpaid vs. SIM-Only – What’s the Difference?

Postpaid SIM-only plans offer the benefits of postpaid billing without device bundles, giving you:

• Monthly bill tracking

• No upfront top-up

• Optional add-ons like roaming or entertainment

Prepaid SIM-only plans typically offer:

• Lower monthly rates

• Flexibility to cancel anytime

• Fewer hidden costs

If you're budget-conscious, prepaid SIM-only plans (like Circles.Life and Giga) are ideal. If you prefer predictability and features like deferred payments, consider postpaid SIM-only from M1 or Singtel.

SIM-Only Plans by User Type

Choosing the best SIM-only plan depends not just on pricing but on your lifestyle, habits, and usage needs. Here’s a breakdown by user persona to guide your selection:

Students

• Needs: Budget-friendly, decent data, no contracts

• Best Plans:

  • Circles.Life 30GB Lite Plan ($12–$15/month)

  • Giga 30GB Plan ($10/month)

Working Professionals

• Needs: High-speed data, some voice, remote work tools

• Best Plans:

  • Circles.Life 250GB + ChatGPT Plus ($18/month)

  • M1 80GB SIM-only with call/SMS ($19.95/month)

Heavy Streamers & Gamers

• Needs: 100GB+ data, 5G speeds, low latency

• Best Plans:

  • Circles.Life Unlimited Boost ($18/month, throttled after 250GB)

  • Singtel 200GB 5G SIM-only Plan ($25–$35/month)

Seniors or Light Users

• Needs: Simplicity, low cost, some talktime

• Best Plans:

  • Zero1 6GB Plan ($9.90/month)

  • Gomo 20GB with bundled SMS/calls ($10–$15/month)

Prepaid vs Postpaid SIM-Only: Which Is Better?

While the terms are sometimes used interchangeably, SIM-only prepaid and postpaid plans have key differences:

Prepaid SIM-only plans (like those from Giga or Circles.Life) offer better flexibility, while postpaid SIM-only plans (like Singtel or M1) suit users with predictable usage patterns who want extras like roaming bundles.

No-Contract vs Contract SIM-Only Plans

While most SIM-only plans are contract-free, some postpaid plans from M1 or Singtel still come with minimum 12-month durations—especially when bundling entertainment or roaming.

Pros of No-Contract Plans:

• Total freedom to cancel or pause

• Better for short-term users or digital nomads

Pros of Contract Plans:

• May include handset vouchers or bonus data

• Usually more stable pricing for heavy users

If you value flexibility, Circles.Life’s fully no-contract model offers the most freedom—ideal for students, freelancers, and people who travel often.

Do SIM-Only Plans Work for International Travel?

Yes! The top SIM-only providers in Singapore offer affordable roaming via add-ons or bundled regional data. Here's a quick comparison:

So whether you're crossing the border to Malaysia or working remotely in Europe, there’s a roaming-enabled SIM-only plan to fit your itinerary.

What to Watch Out for When Choosing a SIM-Only Plan

• Throttled data limits: Some “unlimited” plans reduce speeds after 6GB or 100GB.

• Limited talktime/SMS: Not all plans include outgoing calls or SMS; check before you sign up.

• eSIM compatibility: If you're using a newer device, confirm that your provider supports eSIM.

• Roaming charges: Always read the fine print on roaming—some “free roaming” offers are limited to specific zones.

Use your telco’s mobile app to monitor usage, manage add-ons, and switch plans if needed. Circles.Life, Giga, and M1 all offer strong app-based controls.

Quick Comparison Recap: Best SIM-Only Plans 2025

Where to Buy SIM-Only Plans in Singapore

Getting started with a SIM-only plan is incredibly simple—no store queues, no paperwork, and no delivery waits if you're using an eSIM.

Online:

• Circles.Life: Sign up in 5 minutes using the app or website. eSIM or physical SIM options available.

• Gomo & Giga: Entire process can be done digitally.

• Singtel & M1: May require login to corporate portals for postpaid SIM-only plans.

In-store:

• Visit telco outlets at Changi Airport, NEX, Causeway Point, or Plaza Singapura for same-day SIM card collection.

Via App:

• Circles.Life Giga, and M1 allow in-app sign-up and number porting.

How to Compare SIM-Only Plans (Key Criteria)

When comparing the best SIM-only plans, keep these five pillars in mind:

1. Data Value – How much do you pay per GB?

2. Speed – Do you get 5G, or are speeds throttled after a threshold?

3. Network Coverage – Is your area best covered by Singtel, M1, or StarHub’s network?

4. Add-Ons – Does the plan include useful perks (e.g., roaming, caller ID, vouchers)?

5. Flexibility – Is there a contract? Can you pause or cancel the plan without penalties?

For instance, Circles.Life scores highly on all five: high data value (250GB for $18), fast 5G, broad coverage (uses M1’s network), perks like ChatGPT Plus and NTUC vouchers, and no contract.

SIM-Only Plans with Perks Beyond Data

Some providers now bundle lifestyle and digital perks with their mobile plans, appealing especially to younger, digital-first customers.

If you’re looking to combine mobile service with day-to-day digital value, Circles.Life delivers the best mix of affordability and premium add-ons.

Do SIM-Only Plans Work with eSIM in Singapore?

Yes! Most newer SIM-only plans now support eSIM (embedded SIM), allowing for instant activation on compatible devices like:

• iPhones (XS and newer)

• Samsung Galaxy S series (S20 and up)

• Pixel 4 and up

• Select Huawei, Oppo, and Xiaomi models

Circles.Life, Giga, M1, and Airalo all support eSIM registration and activation through their apps. This makes switching carriers and setting up a second line incredibly fast and seamless.

Best SIM-Only Plans for Gamers and Streamers

If you're using mobile data for low-latency gaming, Netflix streaming, or 4K YouTube, speed and consistency matter.

Here are the best SIM-only plans for heavy real-time data users:

Also consider a plan with data banking or QoS prioritisation if you game or stream during peak hours.

FAQs: Best SIM-Only Plans in Singapore

What are the benefits of choosing a SIM-only plan over a contract plan?

SIM-only plans are cheaper, contract-free, and ideal if you already own a phone. You save money by not subsidizing a handset.

Which telco in Singapore offers the cheapest SIM-only plan?

Zero1 and Giga currently offer the cheapest monthly rates at under $10. Circles.Life also has budget-friendly options starting from $12.

Are SIM-only plans truly unlimited, or are there hidden limits?

“Unlimited” often means throttled speeds after a high-speed data cap. Circles.Life offers 250GB before slowing, which is among the most generous in Singapore.

Can I keep my current number if I switch to a SIM-only plan?

Yes. Porting is supported across all telcos. You can switch and retain your number in just 1–2 working days.

Do SIM-only plans include 5G coverage?

Most telcos include 5G access in mid- to high-tier plans. Circles.Life, M1, and Singtel support 5G on SIM-only plans.

Can I get international roaming with a SIM-only plan?

Yes. Providers like Circles.Life and Gomo offer roaming add-ons for short trips to Malaysia, Indonesia, and more.

Conclusion

In 2025, SIM-only mobile plans continue to offer the best value and flexibility for Singaporeans across all walks of life. Whether you’re after maximum data, the lowest price, or lifestyle add-ons like ChatGPT access and international roaming, there’s a SIM-only plan built for your needs. Providers like Circles.Life lead the market with high-speed data, fully contract-free options, and generous perks that go beyond calls and SMS. For budget-conscious users, options like Giga and Zero1 remain top contenders. Meanwhile, M1 and Singtel provide excellent postpaid alternatives for those who value bundled features and nationwide coverage. Whatever your data needs or lifestyle demands, this guide helps you confidently compare and select the best SIM-only mobile plan in Singapore.

The best SIM-only plans in Singapore offer unbeatable flexibility, more data for less money, and better value for modern mobile users. Whether you're streaming, studying, or working on the go, there’s a perfect plan out there for your needs.

• For value and flexibility: Circles.Life is hard to beat, especially with its ChatGPT Plus perk.

• For ultra-low cost: Try Zero1 or Giga for under $10/month.

For top-tier coverage and bundled perks: Go with Singtel or M1 if you're okay with spending more.