AWS iot with MQTT

Hey, I created an AWS IoT core certificate to connect from a ios/.net/android. when I tried to connect from my terminal using a Python code that I cloned I managed to connect to my AWS IoT and to send and receive messages.
the problem I’m facing is how to use my certificates to connect from the IOS/.net/android clients…
if someone did it and can help me with that it would be great.