Mouse/trackpad question

Hello,

I was wondering if mice or trackpads are at all compatible with iPhones? I do a lot of writing on my iPhone, especially on the Notes app and sometimes the Word app, with a small Bluetooth keyboard, and I was wondering if I were to get one of those small Bluetooth keyboards that also have a little trackpad on it, or if I were to get a little mouse, I’d be able to make use of it with my phone?

I was thinking something like that might help me to be more efficient with taking notes and such.

Is that a thing?

Thanks very much