I was looking at that a while back, the F3307 is a mini pcie board, the free slot on the Vega seems to be a placement board where someone with skills can solder a mini pcie slot. But if you have a Huawei 3G dongle, try slotting that in the USB port, going to an application such as GMail where you can add a new account, hold the back button until the menu comes up and hit Wireless Settings, in that submenu you can activate 3G and set up APN's, figured it out by accident the other night and don't have a 3G dongle to see if it actually activates. You probably won't get a signal bar on the stock Vega firmware, unless you use AdamG's CyanogenMod which will be relased shortly, that has the bar, and you may need to add Phone.apk and TelephonyProvider.apk from a compatible device (ePad) to /system/app/ before 3G will work. If theres nothing in the kernel stopping it from working. This is purely theory.
If a 3G dongle could work via USB, it might be a cheaper alternative to add an extra USB port to the device than buy the F3307 and have a PCIE slot soldered on. Although the F3307 will also enable GPS functionality.
Edited by JordanT92, 07 January 2011 - 04:33 PM.