Starhub has made a similar move after both Singtel and M1 offered extra data at a significantly reduced price, possibly in a response to MyRepublic earlier announcement on their mobile subscription plans.
Starhub offers the lowest price of just $3 for an additional 3GB worth of data upsize per month but the price increases to $6 for sign-up and contract renewals from 1st April onwards. In comparison, Starhub 4G3 mobile plan along with the data upsize costs the lowest in similar tier among the three telcos.
However, contrary to Singtel and M1 which offers up to 12GB data upsize depending on the mobile plan tier, Starhub doesn’t offer any more than the said 3GB data upsize.
Update 11th March 2016, 6:48pm: We have updated the article with some corrections on the details.Learn more from Starhub