1- I have an Omnia SFR France (208; 10 11 or 13) Branded version. I used many cocked versions then i went back to the official version (Singapore DZIA5). I followed the instructions described here :Sonora post
My SIM card is moroccan either Medi Telecom or Maroc Telecom (MCC; MNC) (604 00; 604 01).
When the new rom correctly installed i was surprised the phone was locked (net under a lock).
2-I used the method provided here unlock-omnia-it-works. Nothing still network locked and everytime i use this method i get the message (SIM Failure Error Happened).
3- I upgraded the phone version to with this IB2 Phone Version. I used Grand Prix 1.8.10.
Then I used the method described in the step 2. It works.
I started writing this post to ask for help. I hope this can help someone.