di po lalabas yung network operator nang SIM pag naka lock siya
so in your case.. MF600 is case bundle with Globelines Broadband package right.. and you take off the old SIM card (which you cant use now, since the SIM card is already disconnected from the provider) and changed it with another SIM card...
it seems that the operator name appears on your SIM... so in this case. open line siya.. try mo magpasa nang 2peso sa load para makaconnect.
this time GLOBE naman ako... hehehhe.. nung una naka SMART ako..