If you press and hold on a contact you will be able to choose the other numbers associated with it (mobile, office, car, etc).

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Treo 600 -> Treo 650 -> Treo 700p -Treo 700wx -> Mogul -> Touch Pro
-You may like to flash, but your phone shouldn't LED Killer
- It's Totally Tabular - HTC 5 & 6-Tab Home Plugins