LG MX8550 Service Manual page 20

You can edit NAM1 Mobile Country Code.
Press softkey "OK" (Message key) to edit more NAM1 items.
Press softkey "Back" (Contacts) to edit previous NAM1 items.
11) NAM1 NMSID
You can edit NAM1 NMSID.
Press softkey "OK" (Message key) to edit more NAM1 items.
Press softkey "Back" (Contacts) to edit previous NAM1 items.
12) NAM1 True IMSI MCC
You can edit NAM1 True IMSI MCC.
Press softkey "OK" (Message key) to edit more NAM1 items.
Press softkey "Back" (Contacts) to edit previous NAM1 items.