How to Connect Two iPhones to Bluetooth
Bluetooth can allow your iPhone to communicate wirelessly with other Bluetooth-capable devices, such as headsets, speakerphones and speaker systems. If you and a family member both have iPhones, you can connect the iPhones to the same Bluetooth device.
Power on the Bluetooth device you would like to connect with your iPhones and place it near them.
Press the "Settings" menu button on one of the iPhones.
Select "General" from the menu that appears and then select "Bluetooth."
Ensure Bluetooth is switched to "On" at the top of the screen, and wait while your phone searches for new Bluetooth devices around it.
Select the device you would like to connect to your phone from the list that appears. When prompted, enter in the pairing code for your device. The pairing code is a series of letters and numbers unique to each Bluetooth device. You can find your devices pairing code typically on sticker on the device itself or its manual.
Repeat the process with the second iPhone.