From the Dial Pad
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Press the number keys to enter the phone number
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Tap on the blue Call Key
From the Contact List
Please Note: The "All" Tab contains your native contacts from your smartphone. The "Buddies" Tab contains all your coworkers.
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Tap the contact you need to call
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Tap on the contact's number you need to call
From an Open Instant Message
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Tap the Phone Handset Icon