Steps to Port a Number​ from Prepaid to Postpaid with Circles.Life - Re-opt

Thinking of moving from a prepaid plan to postpaid in Singapore? You’re not alone.

Many users start with prepaid for the flexibility and control but eventually realize that postpaid plans offer more value, convenience, and rewards. If you’re tired of topping up manually or running out of data mid-month, switching to a postpaid plan could be the upgrade you need.

In this guide, we’ll walk you through everything you need to know about porting your prepaid number to a postpaid plan with Circles.Life, from benefits and requirements to the actual steps and special promos available now.

What Are Prepaid and Postpaid Plans?

Before switching, it helps to understand the core difference between prepaid and postpaid mobile plans.

• Prepaid Plans require you to pay upfront before you can use any services. You top up your account manually or through auto-reload, and your usage is limited to your balance. These plans are popular with users who want control over their monthly spending or don’t need a lot of data.

• Postpaid Plans, on the other hand, let you use services first and pay later. They are typically through a monthly bill. You’re charged a fixed amount (with optional add-ons), and some plans offer unlimited talktime, roaming access, and exclusive perks like cashback or vouchers.

Circles.Life Prepaid Plans

Circles.Life is known for its data-first, no-contract SIM-only plans, but it also offers simple prepaid options for users who want pay-as-you-go flexibility. Prepaid plans are ideal for short-term use, light data users, or those not ready to commit.

However, if you find yourself constantly topping up or using more data each month, Circles.Life’s postpaid plans offer far better value with features that go way beyond just talk and text.

Take a look at Circles.Life’s current postpaid flash sale plans (perfect for upgrading from prepaid):

Why Switch from Prepaid to Postpaid?

Switching from prepaid to postpaid isn’t just about convenience—it’s about unlocking better value, greater flexibility, and a smoother mobile experience. Here are the key reasons to make the move:

• More Data, No Manual Top-Ups

  Postpaid plans give you more GBs upfront and you won’t have to worry about running out of credit or topping up mid-month. Perfect for streamers, remote workers, and social media users.

• Added Perks & Rewards

  Circles.Life postpaid users enjoy monthly lifestyle perks, like discounts on Foodpanda, NTUC FairPrice, Shopee, TADA rides, and more. You don’t get these with prepaid.

• 5G-Ready, Travel-Friendly

  Get access to 5G speeds and free roaming across 7 popular countries, making postpaid plans a top choice for those who travel or need high-speed connectivity.

• No Hidden Charges or Lock-In

  Circles.Life postpaid plans are no-contract, so you can switch or cancel anytime without penalty—just like prepaid, but with more features.

• Auto Billing for Peace of Mind

  With postpaid, your bill is charged automatically at the end of the month. No more guesswork or last-minute recharges.

Prepaid vs Postpaid: Which One is Right for You?

Still deciding between prepaid and postpaid? Here’s a breakdown to help you make the right call. While prepaid gives you upfront control, postpaid offers long-term convenience, perks, and better data value—especially with Circles.Life.

Prepaid vs Postpaid Plans: Key Differences

Things to Consider Before Porting to Postpaid

Porting your number from prepaid to postpaid is straightforward, but it’s worth preparing a few things before making the switch. Here's what to keep in mind:

• Check for Lock-In Contracts (If Any)

  If your prepaid number is linked to any bundled or promo-based plan, ensure there are no ongoing contract obligations with your current provider.

• Use Up or Transfer Any Remaining Prepaid Balance

  Once ported, your existing prepaid balance is typically non-transferable and will be forfeited. Spend it before switching.

• Ensure SIM Compatibility

  Make sure your current device supports the new postpaid SIM (especially if switching to a 5G plan). Most modern phones are compatible.

• Have Your ID or Documents Ready

  In Singapore, you’ll need a valid photo ID for verification when porting.

• Your Number Must Be Active

  You cannot port a suspended or expired prepaid number. Ensure your prepaid SIM is working and in use before initiating the request.

• Porting Is Usually Free

  Circles.Life does not charge for porting in. However, check with your current telco if they apply any outgoing admin fees (rare, but possible).

• Backup Contacts and Messages

  While your number stays the same, your SIM will change. Be sure to back up any contacts or SMS stored on the old SIM card.

Steps to Port from Prepaid to Postpaid with the Same Telco

If you're staying with the same telco but want to upgrade from prepaid to postpaid, the process is usually simple. Here's how to do it:

Step 1: Check Your Eligibility

Make sure your prepaid account is active and registered under your name. Some telcos may not allow transfers if the number is not officially registered or if it’s under another person’s ID.

Step 2: Choose Your Postpaid Plan

Review the available postpaid plans and select one that fits your data, talktime, and lifestyle needs. If you're with Circles.Life, explore flash deals like 400GB for $12/month or 1TB for $27/month with lifestyle rewards included.

Step 3: Submit a Porting Request

Go to your telco’s app, website, or retail store and request to convert your line from prepaid to postpaid. If available, choose to retain your current number.

Step 4: Complete Identity Verification

Provide the required photo ID for identity verification. This is a legal requirement in Singapore for number transfers.

Step 5: Wait for Confirmation and Activation

The switch usually happens within a few hours, though it may take up to 1 business day. You’ll receive an SMS once your postpaid plan is active—no change to your mobile number.

Steps to Switch from Prepaid to Postpaid with Another Telco

If you’re moving from a prepaid number on one telco (e.g. Singtel, StarHub, M1) to a postpaid plan with Circles.Life, the process is just as simple—plus, you get to keep your number. Here's how it works:

Step 1: Make Sure Your Prepaid Line is Active

Your number must be in use and not expired or suspended. Porting cannot proceed from an inactive prepaid line.

Step 2: Pick Your Circles.Life Postpaid Plan

Choose a SIM-only postpaid plan that suits your needs. Circles.Life currently offers data-heavy, no-contract options with lifestyle perks and roaming.

Example: 650GB for $15/month (promo), or 1TB for $27/month with $10 movie ticket perks.

Step 3: Sign Up and Start the Port-In Process

Download the Circles.Life app. During sign-up, select “Keep my current number” and enter your prepaid number and telco.

Step 4: Complete Identity Verification

Upload a valid ID (NRIC, FIN, passport) for Singpass verification. This step ensures your prepaid number is linked to you.

Step 5: Insert the Circles.Life SIM and Wait for Activation

Once approved, insert your new Circles.Life SIM card. Porting usually completes within 1 business day, and you’ll receive a confirmation SMS once it’s live.

Common Porting Issues and Resolving Them

Switching from prepaid to postpaid is usually smooth but occasionally, users face minor hiccups. Here are the most common porting issues and how to fix them quickly:

1. Port Request Rejected by Current Telco

Cause: The prepaid number isn’t registered under your name, or there are mismatched details.

Fix: Visit your current telco’s service centre to update your ID information and ensure the number is under your name before retrying.

2. Prepaid Number Is Inactive or Expired

Cause: Number has expired or hasn’t been topped up in too long.

Fix: Reactivate the number by topping up or contacting your existing telco before starting the port-in process.

3. Incorrect Information During Sign-Up

Cause: Typos in your name, NRIC, or mobile number during the port-in application.

Fix: Double-check all details before submitting. If already submitted, contact Circles.Life support to update and reprocess the request.

4. Porting Delay (More Than 1 Business Day)

Cause: Porting sometimes takes longer due to system issues or weekends/public holidays.

Fix: Be patient for up to 48 hours. If delayed beyond that, contact Circles.Life via in-app chat or their website support team.

5. Didn't Receive Porting Confirmation

Cause: SMS failed to send or was missed.

Fix: Insert the new Circles.Life SIM to check network status. If your old SIM stops working and the new one connects, your port is complete.

6. Unable to Receive OTPs or WhatsApp Post-Porting

Cause: Delay in system updates across apps and services.

Fix: Restart your phone, update number settings in apps (like WhatsApp), and wait a few hours. Most services sync automatically.

Why Port Your Prepaid Number to Circles.Life?

Circles.Life makes switching from prepaid to postpaid seamless and rewarding. Here’s why it’s one of the best telcos in Singapore to port your number to:

• No-Contract SIM-Only Plans

  Enjoy the flexibility of no lock-in contracts. You can cancel anytime without penalties,giving you prepaid-level freedom with postpaid-level value.

• Unlimited Data Options

  Choose from massive data bundles like 400GB, 650GB, or 1TB, with lifestyle perks built in. Perfect for heavy users, streamers, or remote workers.

• Easy Port-In via App

  No need to queue or fill out paperwork. Start the switch online or directly through the Circles.Life app in just a few taps.

• Fast Activation and Delivery

  Once your identity is verified, your SIM is shipped quickly and porting usually completes within 1 business day with your number fully intact.

Special Port-In Offers for Singaporeans by Circles.Life

Switching to Circles.Life doesn’t just come with a better plan. It comes with exclusive perks just for porting in. Here’s what you can unlock when you bring your number over:

• Cashback or Bill Discounts

  Enjoy cashback or monthly bill credits when you successfully port your number to Circles.Life during a promotional period.

• Extra Data for the First Few Months

  Circles.Life often boosts your plan with bonus data for the first 3 months, which is perfect for heavy users or anyone testing the waters.

• Referral Bonuses

  Already know someone using Circles.Life? Ask for their referral code. Both you and your friend can earn bonus credits or perks once your port-in is complete.

Best Postpaid SIM-Only Plans in Singapore (2025 Edition)

Looking for the best value in postpaid SIM-only plans? Here's a comparison of top telcos based on data, features, and pricing:

Last updated on: JULY 2025

Make the Switch Stress-Free

Switching from prepaid to postpaid doesn’t have to be a hassle, especially with Circles.Life. Here’s why thousands of users have already made the switch:

• Keep your existing number with a simple port-in process

• Choose from data-rich, no-contract plans starting from just $12/month

• Get bonus perks like NTUC FairPrice vouchers, Shopee discounts, movie ticket rewards, and more

• Enjoy free roaming, unlimited calls, and CirclesAI access across all 5G plans

• Activate online in minutes—no store visits, no queues

Whether you're coming from Singtel, StarHub, M1, GOMO, Giga, or SIMBA, Circles.Life makes porting smooth and fast.

Start your switch today and claim your mobile + lifestyle rewards now.

FAQs on Switching to Postpaid in Singapore

Can I port multiple numbers?

Yes. Most telcos, including Circles.Life, allow you to port multiple lines. Each number will require its own verification and plan selection during the sign-up process.

Will I lose my WhatsApp or bank OTPs?

No. Since you’re keeping your number, all linked services like WhatsApp, banking apps, and OTPs will continue to work as usual after the port is complete.

How long does porting take?

Typically, porting takes a few hours to 1 business day. You’ll be notified by SMS once it’s successful. Keep your current SIM active until then.

How many times can you port your number?

There’s no hard limit, but excessive porting may raise red flags for telcos. That said, switching once or twice a year is common and totally fine.

Can I go back from postpaid to prepaid?

Yes. You can switch back by terminating your postpaid plan and signing up for a prepaid line, either with the same telco or another provider.

What happens to my prepaid balance after converting to postpaid?

In most cases, your remaining prepaid balance will be forfeited, so it's best to use it up before initiating the port.

How to transfer prepaid balance to postpaid?

Unfortunately, most telco, including Circles.Life, do not allow direct transfers of prepaid credit to postpaid accounts.