i have a cingular 650 and wew told it was unlock. well i used it in the us with prepaid sims and it works fine. went to canada and did the same no problem.
went to south america found out that it works with some company but don't with others. did some checking and found that the 2 company in the same country use the same 900mhz and yet my 650 won't connect to one of them.
i just insert sim from one company and boom it work.
a couple weeks i decide to try the other compant since the rates was gooood but found out that my 650 won;t connect.
the guy SR at the other compant try all he knew but could not get it to registered to their network. he sugest that the phone had a problem.
I WOULD ACCEPT ANY ADVICE BECAUSE I AM GOING TO INDIA SOON AND WOULD LIKE TO KNOW ITS REALLY UNLOCK.

THANKS.