The is nothing to show you in an example…
What I am saying is If you are using Hype Reflect to preview the project on your iOS device, the sms will not work.
So in Hype Reflect you can click the Safari button at the top and send the preview to Safari on the the device.
Or export the project and upload it to your server. And then use your device to view it.
Also the correct format for iOS in the sms URL. uses a & after the telephone number instead of a ?.
Bottom line is it does work on IOS.