First thing I would do is back up the data (using the Backup/Restore function in Desktop Manager) and then upgrade the handheld operating system.
http://www.blackberryforums.com/gene...ilanguage.html is the place to start.
You will be able to use voice, SMS and all data functions over the WiFi at home. We don't have signal in the basment of our home; all four people use T-Mobile BlackBerrys with WiFi and UMA.