Samsung SPH-A680SSAQST - Manual (Page 65)

Section 2D: Controlling Your Roaming Experience 57
Checking for Voicemail Messages While Roaming
When you are roaming off the network provided to you, 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 period of time.
To check your voicemail while roaming:
1. Dial 1+area code+your wireless phone number.
2. When you hear your voicemail greeting, press .
3. Enter your pass code at the prompt and follow the voice
prompts.
When you return to your network, voicemail notification will
resume as normal.