Hmm, I have not any problem with 3G. But apply this fix.

Tweetian app is broken. Not connected to server. But browser yes.

Same for downloads.maemo.nokia.com
"apt-get update" report: "DNS resolve timeout".
from my PC connected via same wifi:
~> ping downloads.maemo.nokia.com
PING e900.g.akamaiedge.net (23.63.67.200) 56(84) bytes of data.
64 bytes from a23-63-67-200.deploy.akamaitechnologies.com (23.63.67.200): icmp_seq=1 ttl=57 time=42.7 ms

I mean, this is sabotage. If Lumias not better, broke great N9.

:\

Edit: HA! after some magic steps (remove this pkg aceso-iso, few reboots, install aceso-iso deb /have localy stored via ovi-catch, thanks to god & author/, few next restarts .. and downloads.maemo.nokia.com is resolved ..

But Tweetian still only: Serrver connection error.