iOS Application with bluetooth dual mode

I'm about to develop the iOS Application with connect with bluetooth 4.0 dual mode.

But I don't know if

• using Bluetooth 4.0 (CC2564) low energy and dual mode (with edr), Joining MFI Program is a must ?
• If we using Custom profile on BLE, Joining MFI Program is a must ?
• If we using Custom profile on Bluetooth 4.0 (CC2564) low energy and dual mode (with edr), Joining MFI Program is a must ?
• Any case or application can have Data rate more than 1.7 Kbps

Thank you very much.