I have another solution found for the "cannot connect to Twitter/Gmail/Facebook/whatever" problem which can be used without Dev-Mode. In my case it seems to be all about the proxy settings. After using my work WiFi (which needs proxy) switching back to mobile data connection (where naturally no proxy is configured) seems to forget sometimes to "unset" the proxy configuration. So I could use 'gconftool --recursive-unset /system/proxy' and 'gconftool --recursive-unset /system/http_proxy' and am good to go... But I didn't want this to do every other day... So I just set the proxy config for my Mobile Data connection from "No Proxy" to "Manual", but leaving the proxy address fields blank (as they are, no changes) in the connection's Advanced Settings. The following now happens: After switching the connection from my proxy-needing work WiFi to mobile data, the values in /system/proxy and /system/http_proxy no longer get deleted, but are just set to empty values. And with empty values the system actually assumes (what is correctly intended in this case) that it should use no proxy. This worked for me so far. Try it! You don't have to enable Dev-Mode for this. About the Wi-Fi connecting problem however I don't know, for this issue we should look at another configuration place?