I went through the whole signup process, and it was only after they presented me with account information fields that I realized I could only input a US ZIP code. This is common with US startups, and it's really frustrating; it's not often they consider signups from outside the country. If it did mention that it was US-only somewhere, it was not obvious.
Stockpile has improved so much over the years! Check out some of the new features like Watchlist in the mobile app.
For a stock investing company to not have a help number is a red flag!