Sprint Nextel MM-7500 - Manual (Page 272)

262 Section 3A: Sprint PCS Service Features – The Basics
AccessingVoice SMS Messages
To play a Voice SMS message:
ᮣ When you receive a voice message, it will automatically
appear on your phone’s main display screen. Use your
softkeys to view and play the voice message.
To reply to a Voice SMS message:
1. From the Voice SMS inbox, press Reply (left softkey).
2. Select Voice SMS.
3. Record your reply, then press Send (left softkey).