I can’t guarrantee these work for ALL Sony Ericsson phones, but they work for my T616
To view your IMEI number: *#06#
This is the identification number of your SIM card. I think it’s how the cell phone towers know that you are who you are. Your phone number gets mapped to this number.
To check if a phone is locked: (left) * * (left)
An open padlock means it’s unlocked, a locked padlock means it’s locked. I’m not sure what MNC2 and MNC3 are.
To get to the service menu: (right) * (left) (left) * (left) *
There’s all kinds of crazy stuff in here, nothing really configurable, though. If you go to Service Info. then SIMlock it’ll show you similar information to the locked/unlocked menu from above. The number next to each padlock is the number of attempts you’ve made to unlock your phone. By default I have 5 attempts for each category.