Performance Test / Load Runner on Mobile Application Concept

Hi,

Would like to confirm on the performance test / HP Load Runner on mobile application concept.

Let's say i have a customer to test on their new mobile application with 1000 concurrent users on iPhone 4, 5 and Samsung Galaxy S3, S4 for example. Questions are:

1. How do I script? Do i need to have real device (both iPhone 5 and Samsung Galaxy S4) when scripting?

2. Do i need emulator to do scripting?

3. With 1000 concurrent VU, do i need multiple LGs like performance testing on normal desktop web app as well?

4. Or,  in all those LGs, i need to have emulator to run the script?

5. The licensing model is still based on total num of VU, not devices type isn't it?

Thanks in advance.

-Q-