There is 2 methods-
Use winlock to see the state of the locks, pressing Read Info.The Counter is the number of times that you have tried unlock your phone using an incorrect master code.
You can check it entering an imaginary mastercode on your phone but, it s not recommended because if you try enter a code 5 times your phone will not work anymore. By example, if you press at your phone #pw+1234567890+2# (note that # , p , w and + characters must be selected from * key) and your phone give you Code Error then your phone have lock 2 closed, if you get the message SIM Restriction Off your phone have lock 2 opened.
Look the table above to see how can check all locks-
Lock number Description Sequence to Check
1 Provider Lock #pw+1234567890+1#
2 Network-Lock #pw+1234567890+2#
3 Another Provider Lock #pw+1234567890+3#
4 SIM Card Lock #pw+1234567890+4#