I created an account on sMiles on 2022 and have tried a few times since then using different mobile phones and I never got the app to track a single step. I have no clue on how to get sMiles to start tracking my steps, and I'm probably missing something here, like a somehow hidden START button or something.

I've used a few different apps, like Sport Tracker, Wikiloc, OsmAnd (Open Street Map), etc., and all of them have worked very well and consistently in all those different phones.