Viewing the display screen, Means your phone cannot find a signal, Indicates the call is on hold – Sanyo SCP-2400 User Manual

Page 13: Indicates a call is in progress, Indicates the 10-4 service is enabled, Indicates the 10-4 service is unavailable, Indicates 1x service is available, Indicates 1x service is not available, Indicates 1x data/10-4 access is active, Indicates you are off the home network