There's a whole section dedicated to Straight Talk starting on page 64 of the User Guide. Sprint's network only supports a 3-way conference call though, unlike the original GSM version.
Quote:
Straight Talk
Your device features Straight Talk™, a technology that integrates messaging, voice call, and three-way
calling. With a dual microphone and speaker that enhance voice quality and reduce noise, Straight Talk
turns your device into a conference room speakerphone system.
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