I want to connect a obd2 bluetooth device. Do i have to buy an android?

Recently bought an DTC reader to be able to record tech data from my car. (elm327 obd2)

Simple to connect to my wife´s samsung and my laptop.

But what is the problem with my Iphone? it just doesn´t find the bluetooth device?

Seems like a very rudimentary demand on a modern mobile...

What am i doing wrong?