NTT docomo MONO MO01J Instruction Manual page 140

SIM unlock
This terminal supports SIM unlock. If you release SIM lock, you
can use SIM by a carrier other than NTT DOCOMO.
･
Available services and functions may be limited. DOCOMO is not
liable to any failures or malfunctions.
･
For details of SIM unlock procedure, refer to NTT DOCOMO
website.
1
Insert SIM card provided by other company
2
Power on the terminal
3
Enter the SIM unlock code
4
[Unlock]
138
Appendix/Index