The per day limits get reset at midnight everyday, AFAIK. At least with some providers (or all?) there is no carryover of unused data day by day. It would be 1.

The per day limits get reset at midnight everyday, AFAIK. At least with some providers (or all?) there is no carryover of unused data day by day. It would be 1.5GBx90 only if the user uses 1.5GB every single day.