Transferring through bluetooth

Hi. I have a Nextel I870 and when I try to transfer a song from my MP3 player through bluetooth to my friends phone, it doesn't let me. These are songs I took from my own cd's. Same with him when he tries to send a song through bluetooth. Is it just restricted or am I doing something wrong? Any help would be greatly appreciated. Thanks.

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the i870 only support hf and modem support through bluetooth