Looks like a good initiative.
A few findings from my side.
1) One mistake: somehow my eight mobile line is not listed.
2) Good that my two StarHub Prepaid S plan numbers are listed. This is correct as the numbers are classified as Postpaid as per IMDA classification.
3) The free SIM Card which comes from my SingTel Fibre Internet plan counts as one line.
4) The SingTel hi! 4G postpaid number which was terminated on 19 Feb 2026 is still listed. Not sure when it will be gone.
*****
Please note:
What may not be captured yet: If you have ported a mobile number from one mobile service provider to another, it may take up to 4 days for telcos to update.
What is not included in the 10-SIM card postpaid limit: Corporate Individual Scheme (CIS) plans; data-only SIM cards that cannot send SMSes and make calls; and mobile numbers under a Family Plan that is registered under another family member.