Porting from M1 to Singtel

[camholicx]

I am now using M1(main lines and 2 x supplementary lines) and would like to port to Singtel.

As the supplementary lines are used by my parents, and if I will to sign up at Singtel porting today. Do I need to change my parent sim card by today also?

 

[xonix]

I am now using M1(main lines and 2 x supplementary lines) and would like to port to Singtel.

As the supplementary lines are used by my parents, and if I will to sign up at Singtel porting today. Do I need to change my parent sim card by today also?

Below link Q.12 could be relevant to your question :
https://www.m1.com.sg/support/faq/planoptimisation-new-simonlyplan-faq