This wouldn't be bad if rollover data was good for more than one month. However, if the data expires after one month, and you don't use it first, than it usually is useless. Here is how it works in practice:
Primary allotment first January: Use 1GB of 2GB allotment. (1GB to rollover) February: Use 2GB of 2GB allotment. (0GB to rollover) March: Use 3GB (2GB allotment + 1GB overage)
Rollover first January: Use 1 GB of 2GB allotment (1 GB to rollover) February: Use 2GB - 1 of rollover, 1 of allotment. 1GB to rollover March: Use 3GB (1GB rollover, 2GB allotment, 0 overage)
In the second case you have "useful" rollover. In the first case you use the same amount of data, but have to pay for overages.
Re:
@Mason Wheeler
This wouldn't be bad if rollover data was good for more than one month. However, if the data expires after one month, and you don't use it first, than it usually is useless. Here is how it works in practice:
Primary allotment first
January: Use 1GB of 2GB allotment. (1GB to rollover)
February: Use 2GB of 2GB allotment. (0GB to rollover)
March: Use 3GB (2GB allotment + 1GB overage)
Rollover first
January: Use 1 GB of 2GB allotment (1 GB to rollover)
February: Use 2GB - 1 of rollover, 1 of allotment. 1GB to rollover
March: Use 3GB (1GB rollover, 2GB allotment, 0 overage)
In the second case you have "useful" rollover. In the first case you use the same amount of data, but have to pay for overages.
> Are they stupid?
Is that a rhetorical question...?