In Asia, I purchased an AT&T Connect Mercury (Sierra Wireless). At 7-11's or many other places, I was able to buy inexpensive SIM cards (1-2Call net sim) with Internet minutes. The last one expired the day before I was to leave for the U.S. so I did not "top up". Upon my recent return, I naturally assumed that I could get a similar kind of SIM here in Hawaii. A local AT&T office didn't really know what I was talking about but the clerk said I could probably get in from AT&T online. Wrong; nowhere could I find such a card. My questions are: Do you know of a place, online or otherwise, that sells the top-up cards? If there is no source for these cards, does it mean that my AT&T Connect Mercury is not usable in the U.S. without signing up for an expensive AT&T plan ($60 for 5 gigs)? Thanks for helping me!
As far as I know, at&t doesn't have any prepaid laptop data options. Since you have your own laptop connect card, I would think you could get a SIM for it at an at&t store without having to agree to a long term contract - but the month to month pricing would still be $60/month for 5GB or $40/month for 200 MB. A prepaid PayGo SIM may work as well, and you'd just buy the data plan with your account funds; but the pricing won't be any better as it is $20 for 100 MB. There have been a couple of prepaid laptop data options discussed out here with better pricing, but you wouldn't be able to use them with a locked AT&T Mercury data card. (IIRC, they may have all been CDMA carriers.)