I was recently given a 2nd hand 8520 which is way nicer than my pearl, problem was that is was originally for Vodafone and we work with Orange. I got the phone unlocked for orange and the email side is excellent from our orange server at work but I cannot make or receive phone calls or SMS but the home screen is showing the orange network with full bars but any time I try and make a call the "call Failed" appears. Can anyone please help????
Might be problem with your phone software, one of my friend got same problem with her Vodafone and you can eliminate this problem after refreshing your phone software .