Kalshi phone verification not working? What to check

Every Kalshi account needs a phone number. At sign-up, Kalshi sends a four-digit code by SMS to confirm it, and a separate four-digit code to your email. After that, two-factor authentication asks for a code once every 30 days when you log in — by text unless you switch to an authenticator app such as Google Authenticator.

Kalshi’s help centre lists these checks for a code that does not come (phone verification, 2FA codes, read 26 October 2026):

• Give it time. SMS codes may take up to 20 minutes; requesting new ones in the meantime can leave you holding an expired code.
• Check the number. Confirm the number on your profile is the one in your hand, with no typo.
• Check your signal, and that the phone can receive text messages at all.
• Switch off spam blocking or call filtering, on the phone or in a carrier app.
• Ask your carrier to enable short-code messages: some carriers block them, and Kalshi’s codes come from one.
• Reply START if you previously opted out of Kalshi’s texts.
• If the code expired, restart the process rather than retyping it.

For the email code, check your spam or junk folder.

Kalshi says “not all international phone numbers are supported at this time” and that you may need to use a supported number to finish signing up. It does not publish a list of accepted number types — nothing current on its help centre addresses VoIP, prepaid or landline numbers — so if a code never reaches a non-standard number, try a regular mobile number on a major carrier.

• To change your number, edit it on your account profile (the pencil icon); Kalshi sends a code to the new number to confirm it.
• If you no longer have the old number, choose “I can’t access my phone” at the code prompt. Kalshi says this works on the web and the iOS app but “isn’t in the Android app yet”, so use a browser from Android.
• Kalshi’s login troubleshooting page says you can regain access yourself without the old number.

If none of that works, Kalshi’s support page says the fastest route is the support messenger while logged in (menu → Get help → Chat with support), with email as a fallback. It offers no phone or text support. Include your account email, your full name and screenshots of the error. Never send a verification code to anyone who contacts you — Kalshi’s codes are only for you to type in.