Samsung SPH-M300ISASPR - Manual (Page 119)

Section 2D: Controlling Your Roaming Experience 95
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Checking for Voicemail Messages While Roaming
When you are roaming off the Sprint National Network, you
may not receive on-phone notification of new voicemail
messages. Callers can still leave messages, but you will need
to periodically check your voicemail for new messages if you
are in a roaming service area for an extended time.
To check your voicemail while roaming:
1. Dial 1 + area code + your wireless phone number.
2. Enter your voicemail passcode at the prompt and follow
the voice prompts.
When you return to the Sprint National Network, voicemail
notification will resume normally.