Testing iOS app on non-local devices

[Richard Miller]

I know Apple makes TestFlight available for testing a pre-release app on 
non-local devices. What options are available for testing at much 
earlier stages of development? In other words, If I have an app running 
on my local iPhone, how can I test this on iPhones and iPads of friends? 
I know I did this a few years ago, but it was necessary then to have the 
UDID of each device. Is this still the case?

Thanks,
Richard Miller