Sanyo RL7300 - Manual (Page 82)

Checking for Voicemail Messages While Roaming
When you are roaming off the Sprint Nationwide PCS 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 period of time.
To check your voicemail while roaming:
ᮣ Dial 1+area code+your PCS Phone Number.
When you return to the Sprint Nationwide PCS Network, voicemail
notification will resume as normal.
Section 2D: Controlling Your Roaming Experience 71