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I tried UC20 with 3G network and it works. I will post the instructions shortly.

jw, pls give your /etc/config/network content.

If you are pretty sure your config is correct. The next two things are:

  1. Make sure 3G antenna is connected, otherwise you cannot register the SIM card
  2. If you used wrong settings (e.g. wrong data port) and you corrected it. If restart network, restart the device doesn't help. Try to unplug the power then plug it again. By unplug the power, the 3G module may reset and works. I met such problem many timess.