Question: Which 3G USB Adapters are supported on the GXV3140?
Answer:

List of supported 3G modems:

For WCDMA:
- Huawei E1750
- Huawei E180
- Sierra Wireless 306

For CDMA2000:
- ZTE AC581
- Huawei EC1260
For EVDO:

- Novatel Ovation MC760