Auto Dial a # from an email?

[abgray22]

I was told before I purchased the HTC Thunderbolt that you could auto-dial a phone number from an email. I work at a doctor's office and we have our after hours voicemails sent to our email which comes to our phones. On the Droid 2 when we receive a voicemail via email message the callers number shows up in the header of the message and it is highlighted so you can just click it and call the person back. The Thunderbolt will not allow this. Even in a regular email it will highlight the number but when you click on it it will go to a different page and say this webpage can not be found. Does anyone know if there is a setting that you can change to allow auto dial. If not we will have to switch our phone back to the Droid 2. Thanks!