LG MX8550 Service Manual page 21

You can edit NAM1 True IMSI NMSID.
Press softkey "OK" (Message key) to edit more NAM1 items.
Press softkey "Back" (Contacts) to edit previous NAM1 items.
14) NAM1 PRL Enabled
You can see NAM1 PRL Enabled.
Press softkey "OK" (Message key) to edit more NAM1 items.
Press softkey "Back" (Contacts) to edit previous NAM1 items.
15) CDMA Home SID/NID
You can edit NAM1 Home SID/NID pair.
Press softkey "OK" (Message key) to edit more NAM1 items.
Press softkey "Back" (Contacts) to edit previous NAM1 items.