Just a quick heads up, Cellular Live Tile for Windows Phone has gone free from now until the 25th [Christmas Day]. At which time the developer will also release a major update to version 3.0 for the app.
If you haven’t tried the app it lets you monitor your network signal strength, speed, data and roaming status directly from a customisable Live Tile that you can place on your home screen. The tile can also act as a direct link to your network settings, and the app will notify you of a range of changes in connectivity. SO pick the app up now from the Windows Phone Store, and be ready for some major improvements when the update hits.