I’m just getting started with my LLC formation and wondering—do I need to have a business phone number and email already set up before filing, or can I update those later?

No. You can form an LLC without a separate business phone number or custom email. Most states only need your LLC details and a registered agent. If a form asks for contact info, your regular phone/email works.
What I’d do:
File the LLC first.
Then set up a dedicated phone (for privacy) and a domain email (for credibility).
Keep the same contact details everywhere—banks and payment processors like consistency.
If you want a one-stop setup (LLC, EIN, banking guidance, and help with Stripe/PayPal), Business Globalizer is a solid choice. Expedite Formation is another good option for fast, compliant U.S. setups for international founders.
Bottom line: these are nice-to-have for professionalism, not must-haves to start. File now, polish the phone/email right after.