# Data Dedicated Transmission Mode

When your device has an active data connection, you can enable the Data Dedicated Transmission Mode (DDTM) and divert all incoming voice calls to your voicemail box.

To enable Data Dedicated Transmission Mode:

1. Tap Start > Settings > Personal tab > Phone > CDMA Services tab.
2. Select DDTM Mode on the list of available services, then tap Get Settings.
3. Select On to divert all incoming voice calls to your voicemail box every time your device has an active data connection.
4. Tap OK.