LG MX8550 Service Manual page 25

You can decide to edit NAM2 items.
Press softkey "OK" (Message key) to skip NAM2 items setting.
Press softkey "Edit" (Contacts) to edit NAM2 related items.
26) Phone Model
You can see the Phone Model Number.
Press softkey "OK" (Message key) to edit more items.
Press softkey "Back" (Contacts) to edit previous items.
27) Slot Cycle Index
You can edit Slot Cycle Index.
Press softkey "OK" (Message key) to save Slot Cycle Index.
Press softkey "Back" (Contacts) to edit previous items.