HTC has released a software update, version 1.62.502.0 for the Tilt offered with AT&T. The new ROM update enhances Bluetooth as well as the overall device performance and stability. It also enables Dual-tone multi-frequency (DTMF) tones for the hardware QWERTY and includes the Microsoft Adaptation Kit Update (AKU) 0.4.4. HTC says that the upgrade could take up to 10 minutes and you should backup all your data before proceeding with the 1.62.502.0 installation.
HTC Tilt Specifications