Finally, success in getting 3G in Plasma Active on Nexus 7 to work. 😀 I uploaded a patched version of ModemManager to the Nexus 7 hardware-adaptation repository. So far, it seems to work pretty reliable.
Please note that I disabled the pin on my sim card. I don’t know if this is necessary but it was at least one point less I had to worry about. You can find instructions on how to disable the pin here (I got these instructions from this web site.).
For those of you who like a little bit more detailed information: the trick is to replace the dial command “ATD…” with “AT+CGDATA=\”PPP\””. You can find the patch in the patched ModemManager package in the Nexus 7 hardware-adaptation project.
ruedigergad 
Pingback: Suspend/Resume in Plasma Active on Nexus 7 3G with WWAN | ruedigergad
Hello Gad,
please, is there any way to have 3G/UMTS connection through a OTG cable and one 3G stick in nexus 7 (under plasma active)? I have see this article “enabling-umts-on-archos-g9-in-plasma-active” but repository “http://repo.pub.meego.com/…” don’exist anymore.