Audiovox SMT 5600 / SPV C500 (HTC Typhoon)

hey guys, im having problem with my smt 5600, i dowloaded binary's smart explorer so i can now send files to friends. But when they try to send files to my phone (and only my phone) all their phones say that the service is not supported. They find my phone when they do a search but they cannot connect because of this. Through my phone i can find and connect to them and send them files and my phone will say that the 2 phones are connected, but when they try to send me something they cant because the service is not supported for soem reason. It's like theres some firewall or something. This is starting to get annoying because they send all kinds of songs to eachother but nothing to me. How can this be fixed?