Unlocked Apple IPhone and Outgoing call failure

I got a Apple IPhone from US to India. All IPhones brought in US is locked and can be used only with AT&T. I unlocked it with redsn0w to use it in India. Bingo my phone got unlocked. I was using Spice (now Idea). I was using it without any issues. It was when 1 sec pulse came to India, introduced by Docomo that I thought of changing my SIM.

Unfortunately I realized that my Unlocked IPhone worked only with my Spice SIM.

What was worse is that it did not work while on roaming. I tried updating the firm ware, restoring the phone to original setting etc but of no use.  I knew others who have unlocked the phone using the same method as mine but having no issues with their phones. It was not a hardware problem either as my phone was working fine with Spice SIM.

When Apple released the firmware 3.1.2 I tried again. I restored the Phone with firmware 3.1.2 using iTunes (restoring the phone to factory settings locks the phone again) and this time unlocked it with blackra1n. I think this is the easiest way to unlock the IPhone. It comes with a single button on it. Just plug the IPhone to the computer and press this button and under a minute the phone is unlocked. Can unlocking become easier than that? Below is the screen shot of the tool.

However this did not solve my issue with outgoing calls. Googling it I came to this link, which worked for me

All I had to do was
1)    Go to Settings > General > Date and Time. Switch off “Set Automatically” and manually select your hometown (the default is Cupertino).
2)    Next, go to Settings > Phone > Show My Caller ID > Switch this to “ON”.
3)    Turn off turn off Settings > Phone > Call Forwarding and Settings > Phone > Call Waiting.
My IPhone now can make calls with any SIM and has no issues with Roaming.

However I noticed one another issue. I was getting an annoying message "Call Forwarding Active" for all outgoing calls.