Terms & Conditions

1. By subscribing to ZYM Mobile, you agree to the written Service Agreement.
2. Starting February 28, 2026, Singapore is capping postpaid SIM card registrations at 10 per individual across all telcos to curb fraudulent activities, though corporate accounts registered under a Unique Entity Number (UEN) remain unaffected by this individual limit. For more details, refer to New Postpaid SIM Limit FAQ.
3. [Number Porting] Porting your mobile number to ZYM Mobile typically takes up to 5 working days, subject to nationwide inter-telco daily porting quotas. Transfers may occasionally experience delays or fail due to mismatched registration particulars, technical disruptions, or processing hold-ups with your donor carrier. In the event of a port-in delay or failure, ZYM Mobile accepts no liability for any resulting inconvenience or losses, and no refunds or compensation will be considered. If a port-in request fails and remains unresolved for more than 4-week, the temporary number assigned to you upon registration will automatically be converted into your permanent postpaid number: Learn more about number porting.
4. [Connect to Preferred Roaming Operator] Data roaming is enabled automatically by default. For an optimal experience upon arrival, turn on Data Roaming in your device settings and temporarily turn off or remove any secondary SIM cards. If your phone does not connect automatically, please manually select our preferred partner network in your phone’s network settings. If your plan includes complimentary roaming or an active add-on, refer to the full list of ZYM Preferred Roaming Operators to choose the right carrier.
5. [Roaming calls and SMS are chargeable] Making or receiving calls while overseas is subject to pay-per-use rates. Sending SMS messages while roaming abroad is also chargeable. View the rates and other T&Cs, read here
6. ZYM Mobile runs promotional offers from time to time, including free subscription months upon sign-up or port-in, as well as bonus mobile entitlements. For all programs, read Promotion T&Cs.
7. In accordance with the law enacted on 1 January 2025, all SIM card registrations require the subscriber's personal particulars (Singapore NRIC/FIN). The registrant must be physically present and complete identity verification via their own Singpass or physical identity card. Registering a SIM card using another person's details or transferring an active card to another individual without legitimate grounds constitutes an offence punishable by a fine of up to $10,000, an imprisonment term of up to 3 years, or both.
8. Pursuant to prevailing regulatory requirements, ZYM Mobile and its resellers may decline prospective registrations deemed suspicious and immediately suspend numbers flagged for abnormal traffic. Service restoration is contingent upon the account holder attending ZYM Headquarters in person for mandatory identity verification and providing substantiation for the high call or message volumes detected.
9. [Billing] In the event a subscriber ports out their number, no partial refunds for any unused days in the billing month will be issued. Any outstanding add-on or pay-per-use charges incurred by the subscriber will be included in the final invoice, which will be issued in the following month.
10. [Billing] If subscriber request a port-out near the end of the month, but it doesn't happen until the next month, you'll be charged for the entire new month. No partial refunds will be given in this situation. Your final bill will include any outstanding add-on or pay-per-use charges and will be sent the following month.
11. [Billing] To avoid account suspension and eventually, termination, please ensure your outstanding bill is paid on time. If your account is terminated, you will not be able to retrieve back all mobile numbers associated with the account. To understand more on our billing cycles, refer to Billing FAQ
12. [Billing] You will receive your invoice for the full calendar month on the 5th, covering service from the 1st through the end of the month. Payment is due on the 10th. Your invoice reflects your current full-month subscription fee and last month's pay-per-use charges (If any).
13. [SIM Order] To ensure a smooth SIM activation process, customers MUST accurately enter their Name, NRIC/FIN number, and Date of Birth during the SIM card ordering process on www.zym.sg. These details will be used to verify the customer's identity at the time of SIM activation.
14. [SIM Order] While you can cancel your physical SIM order by contacting ZYM customer care, kindly note that no refund will be issued if you chose SIM delivery (Drop into mailbox / Deliver to doorstep), as the order has already been processed.
15. [IDD v019] Calling from Singapore to a Foreign Oversea Number must have a valid IDD plan to do so. For more info, refer here
16. [FUP] Due to a recent increase in SMS-based scams, all of the aforementioned plans have a daily SMS limit of 300, as per our fair usage policy.
17. [Blacklist] ZYM Mobile reserves the right to refuse service to any individual with previous outstanding balances, those who engage in excessive port-in and port-out activity, or anyone whose conduct is deemed abusive, fraudulent, or unlawful. To regain eligibility for service, customers must settle all outstanding balances in full prior to reapplying.
18. [Advance Payments and Bonus Credits] All funds paid in advance and bonus credits may strictly be used only to offset monthly plan subscriptions, value-added services, or pay-per-use charges (e.g., roaming voice/SMS). Bonus credits have no cash surrender value, are non-refundable and non-exchangeable for cash, and shall be completely forfeited without cash payout if the line or account is ported out, cancelled, or terminated for any reason. Notwithstanding the foregoing, advance cash payments are eligible for a refund upon written request and will be processed within fourteen (14) working days.
19. [SIM Order] If the customer provides incorrect personal or delivery information, they are responsible to reorder the SIM card again through the ZYM website (www.zym.sg). Refunds (if any) will not be issued for previous orders due to the order being already processed.
20. [SIM Order] Please activate your SIM card within 14 days from date of order if you've opted for delivery to your mailbox or doorstep. After 14 days, the SIM card will expire and become unusable. However, if you opted for self-collection of SIM card, you must collect your SIM card within 14 days of ordering it. If you do not collect it by the deadline, ZYM Mobile will automatically cancel your order.
21. [Device Compatibility-VOLTE] Non-local handsets, even with VoLTE enabled, may not work with local VoLTE due to LTE band incompatibility, missing carrier software, lack of roaming agreements, absence of local certification, or other network restrictions. ZYM strongly advises purchasing or using imported handsets and is not liable for any issues arising from non-local devices.
22. [Device Compatibility-5G SA] Access to the 5G Standalone (SA) network requires a 5G-compatible device manufactured for the Singapore market; overseas or imported models may not function properly. As the list of compatible devices expands, subscribers are advised to verify their device brand and model's local 5G support before subscribing. Please note that no refunds or liabilities will be issued if your device is incompatible.
23. [Device Compatibility-eSIM] To use our 5G SA eSIM, you need a 5G and eSIM-supported device purchased locally in Singapore. Overseas or imported models may not work, even if they feature eSIM technology. Because supported devices are updated regularly, please check your specific brand and model's Singapore 5G eSIM compatibility before signing up. We cannot offer refunds or assume liability if your device turns out to be incompatible.
24. [Roadshow Special] Special entitlement -From time to time, ZYM may run sign-up roadshows with special, enhanced entitlements that differ from the base offer shown on www.zym.sg. Any additional enhancements will be added to your plan within seven (7) working days.
25. [Promotion] Effective 27 February 2026, selected plans now include up to 500 free v019 IDD minutes to 16 destinations. Please note that this promotion is currently available for all new sign-ups.