Which iPhone to choose for app testing?

Question

iPhone

Good day to all.
I want to try my hand at writing applications for the iPhone. I have never used iPhones tightly, because I like phones from another manufacturer. But for testing applications, an apple device is still required. I decided to buy some used iPhone, with a minimum investment of money. The question arose, which model is enough for full-fledged application testing?
I will not use the device in everyday life. Interested solely as a platform for testing applications.

Answer 1

iPod Touch 5. I myself use it for testing.

Answer 2

The iPod Touch seems to have been made especially for you. Plus, it's a great player.

Answer 3

If the first experience, then it can be better to try emulation? ios simulator, but I don't know the product distribution conditions)