Atlas is to register a business entity in USA, hence you need a phone number. If you use Stripe already, you need another one in the USA most of the time
From a compliance perspective, the US number is usually tied to your KYC (Know Your Customer) requirements if you’re using a US-based entity like an Atlas LLC. Even if the dashboard lets you bypass it initially, the risk engine might trigger a manual review if it detects a mismatch between your entity location and your contact info. I’ve managed an account for two years using a Google Voice number tied to a US account and had zero issues with payouts or Atlas documentation. It’s safer for the long-term stability of the account