Hi, I had bought a new HTC Desire Handset about a month ago. From the time i bought the phone, I am unable to do call conferences if the Phone is set in the GSM WCDMA mode. If the phone is set to GSM, I am able to do call conferences and talk to multiple people. I spoke to the Airtel technical staff and they say the problem is with the handset and not with them. Please let me know what needs to be done. Please help and let me know if anyone has found similar issues.