Earlier this month Virgin Mobile introduced its 'data rollover' feature for postpaid plans.
The idea is that any unused data allowance carries over to the following month, but only once you've got through that month's allowance. And if you don't use the rolled-over data, it vanishes.
Handset prices start at $0 upfront for the 32GB Samsung Galaxy S6 on $80 or $100 plans, and for the 64GB Samsung Galaxy S6 or 32GB Samsung Galaxy S6 edge on the $100 plan.
They top out at $45 a month for the 128GB Samsung Galaxy S6 edge on the $30 plan.
The Samsung Galaxy S6 and Galaxy S6 edge will go on sale at Virgin Mobile stores on 10 April.