I was able to use this to read and write _Phone Book_ entries to SIM cards from 2 different types of GSM cell phones. The CD-ROM provided was labled USB 2.0, it contained an application named SimCardRead.exe and some DLLs. I did NOT have to install any drivers (Windows 2000 Pro), Windows recognized the adapter as a removable mass storage device and did not ask for drivers.I ran SimCardRead.exe directly off of the CD-ROM. Documentation on CD-ROM is weak.Biggest headache was that SimCardRead.exe will truncate Phone Book names to 13 characters each when writing to SIM cards, although longer names can be read from the SIM cards.