Yes. As long as your member line activates the international roaming service, both the member line holder and the principal line holder will be able to enjoy the same promotion. However, usage charges will be applied separately for each line.

 

For example, using U Data Roam 10 in Singapore:

If the principal line holder and 1 member line use data roaming at the same time in Singapore when they connect to STARHUB, the principal line will be charged RM10 per day and an additional RM10 per day for the member line’s internet usage while roaming.