I have C7 where I have SW version Qt 4.7.3 + Qt mobility 1.2
This can be check by using Qt version info tool found at https://projects.forum.nokia.com/qtinfo/

I created a simple QML app with these
import QtQuick 1.0
import QtMobility.connectivity 1.2

If I run this app I get the following error
Executable file: 11166 2011-06-09T15:08:25 C:\QtSDK\Symbian\SDKs\Symbian3Qt473_12b\\epoc32\release\armv5\udeb\NfcBtChat.exe
Starting application...
Application running with pid 923.
[Qt Message] file:///C:/Private/e0d1e699/qml/NfcBtChat/main.qml:2:1: module "QtMobility.connectivity" is not installed
import QtMobility.connectivity 1.2
^
[Qt Message] ("C:/Private/e0d1e699", "C:/resource/qt/imports") // This is my debug code, ignore
C:\sys\bin\NfcBtChat.exe exiting with 0 allocated cells, 72 handles
Finished.

PS:
I tried to build Qt mobility with myself by increasing version number, it does not allow me to install since there is already built in QtMobility