Samsung SPH-M520ZSAQST - Manual (Page 119)

Section 2D: Controlling Your Roaming Experience 93
Roaming
Checking for Voicemail Messages While Roaming
When you are roaming off the home 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 home network, voicemail notification will
resume normally.