Is ChatGPT the killer app that gets people to buy a Microsoft phone?

No. Because ChatGPT will be available on other platforms that people already use, Microsoft phones will have awful user experience and overall polish, and iOS/Android will soon have something (better integrated) that is likely nearly as good as ChatGPT.

I loved my Windows Phone.

What makes it special if you can use it on all other phones?

It's not that useful from a phone for work. You need to copy/paste large swaths of text into other apps, the UI is small etc.

But aren't many apps using APIs into CHatGPT?

Not really since the API allows to create your own app and its website is pretty mobile compatible too.

I think a multi-modal LLM could give Microsoft a real shot at the phone market. Apps overall will become less relevant as 1-LLM app rules everything. Google could fumble here because they don't really like LLMs as they are a fundamental challenge to their operating model.

I don't think the app itself will be anywhere near enough.

If Microsoft comes out with one, maybe.

I have it on my iPhone.