3G modem performance is spotty at best, I have one in my on site kit as yet I am to find one that works in FreeBSD. However I know that the one 3 sells in the UK that is the Huawei works with 2K windows, XP, Vista, Win7, Linux an OSX (Tiger an above) but it downright refuses to work with the MS server OS's and it through's a fit with Snow Leopard it works but hates it dropping not just connection with he network but screwing over the whole system but according to their support line it's a know issue and a update is on the way.