Do you know, we can expand your iPhone to 37mm Thread Lens and 67mm thread Lens?
It is easy.
For example, this iPhone cover, it is dedicated for DCKina Lens.
You can add a 37mm Thread Adapter, making it fits for any standard 37mm thread lens:
it looks like this:
Indeed, you can have all the lenses with your iPhone as long you wish, just have a ring on the 37mm adapter
here you can find all the rings:
37-58mm Step-Up Adapter Ring (37MM Thread Lens to 58mm Thread Step-Up Ring) | DCKina.com
or check this video: