My wife and I have had good and bad experiences with $5 roaming.  Recently been to Japan and it didn't always auto rollover.  Had to message over 2 separate days/times to correct it.  Spent an hour or so each time, in the middle of a holiday.  Worked in the end but a bit clunky.

On the SC rollover, is it 100% of all current credits accumulated (up to the 40% limit), or 40% of your total SCs goes towards the limit?  Make sense?