If you are using the following products:-

1. MOBITEK Q24 SMS MODEM
   • 
2. MOBITEK Q24 GSM MODEM
3. MOBITEK SMS360 MODEM

The USB driver for Windows 8 (32 bit and 64 bit) is the same as the driver for Windows 7 — version 3.3.0.1

Warning: DO NOT allow Windows to automatically update the driver as other versions do not work.