SOURCE: sim lock
it sounds like the phone is locked to the original carrier. you can get an imei unlock code for most GSM Samsungs here: http://www.gsmunlocklabs.com/samsung-imei-unlock-code-p-245.html
you can find the instructions on how to enter unlock codes for samsung phones here: http://www.gsmunlocklabs.com/samsung-unlock-code-entry-instructions.php
SOURCE: I have a Samsung SGH-J750 Cell. I went to Ukraine
Go to your service provider and ask for assistance. Or do you still have your old PUK number. After you press the sim pwd a few times the phone will be blocked.Then use you PUK number which you got when you registered your SIM or bought it and simply go from there and unblock your phone and change the passwords or security code
SOURCE: WRONG CARD
Maybe the card isn't compatible with the D407? Google D407 SIM card model number, or bring the card and phone to either a phone store or Radio Shack, they can check it for you.
SOURCE: WHEN I INSERT SIM CARD
DEAR SIR...
THIS PROBLEM SHOWS THAT EITHER THE NETWORK IS NOT REACHABLE OR PROBLEM WITH YOUR MOBILE....
JUST GO TO UR MOBILE SETTINGS AND SCN FOR NETWORK MANUAALY,IF YOU DONA FIND YOUR NETWORKIN THE LIST BEING SCANNED,THE PROBLEM LIES WITH THE NETQORK AND IF YOUR MOBILE DOESNT LOAD ANY NETWORK PROVIDED THAT THE NETWORK IS ACCESSIBLE FROM OTHER MOBILES,THEN THE PROBLEM LIES WITH YOUR MOBILE....
IF PROBLEM WITH THE MOBILE,THEN THE BEST SOLUTION IS TO UPGRADE YOUR MOBILE SOFTWARE,WHICH ALSO INCREASES YOUR MOBILE SPEED,,,,,
THANK YOU...TAKE CARE........
SOURCE: How to unlock my samsung
There can be many ways to Unlock your phone. As far as i know unlocking by codes is the simple and safe way. I will suggest the website Unlock-Zone.com which is doing good service and they were recommended highly in the cell phone forums.
I used them to unlock my cell phone. contacted them and within 30 mins i had my unlock code and my phone was unlocked.
Hope this helps.
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