Using an Archos 3G modem with an Acer Iconia tab (Android Honeycomb)
It's plug-and-play on your PC because the industry has an established standard for driver infrastructure in Windows &amp; OSX. Android isn't as friendly to 3rd party drivers. There's some limited success reported with specific models of 3g dongle - you may need to switch devices. Here's a partial list from XDA:


  
  ZTE MF 639 (might need roaming enabled to get data working)
  Vodafone K3765-H
  Vodafone K3715
  Vodafone K3565 / Huawei E160
  Huawei E169
  Huawai E170
  Huawai E171
  Huawei E173
  Huawei E1550
  Huawei E1692
  Huawei E1750
  Huawei E1752
  Huawei E1820
  HUAWEI K3520
  HUAWEI K3565 -Rev 2