Can I run test calls before switching my real line?

That's exactly what the demo line, live in 15 minutes, is for: call, don't pick up, get the text, reply, push through to the test appointment. As many calls as you want, in French and English, with different scenarios — emergency, quote, wrong number. Test the edge cases too: ask the AI for something impossible, and check that it says so honestly and flags "needs review". Switching your real line over only happens after your green light.