my company just switched from unlimited usage on our at&t wireless to a limit of 5 gigs per month. We've been told that if that amount is exceeded, our cards will be shut off automatically and will not be re-activated until the next month, and there is nothing anyone can do about it. To prevent this from happening, i need to know how many minutes 5 gigs actually is, so that i can track my usage and not have my internet shut down as it is required for business. Anyone know what the conversion is?