d3p
PowerHouse
I don't use headphones so no use for iPhones BT.
I don't know about iphone 4 or 4s. But with Iphone 5, i can connect my Nokia BH505 & Plantronics Back beat 903+ Bluetooth Headphones for calling & music. Its the same with ipod 5Gen too. Infact i have connected multiple devices to an ipod5G like Belkin Bluetooth media steamer for wireless music over speakers, through Bluetooth again.
I agree, it doesn't support BT File Transfer Protocol.