Good question. Since the minutes aren't on your account until after you redeem the card, the 90 day expiration window wouldn't start until after you activated.
So, are you saying the E refill card can be kept indefinitely before activating? I googled it and, couldn't get any info on this matter. I only need it to hang around for a few weeks since, I reup on my birthday (in order to remember each year) and, today is cyber Monday November 26th and Target has a bit of a deal for today only.
Thanks for your help