This app was mentioned in 3 comments, with an average of 1.33 upvotes
Mazda offers a remote start service, at least in the US, that runs over cellular and a phone app.
It's a shit show.
Read the Reviews
I don't know about iOS, but the Android app has abysmal reviews. https://play.google.com/store/apps/details?id=com.mazda.mms
This is on mine but costs $65 a year.