Viewing the display screen, Means your phone cannot find a signal, Indicates the call is on hold – Sanyo Katana Cell Phone User Manual

Page 13: Indicates a call is in progress, Indicates 1x data access is active, Indicates 1x service is available, Indicates 1x service is not available, Indicates you are off the home network, Indicates your phone is on analog service network, Indicates you have missed voice calls