Cash App 'Unable to Sign In on This Device' — Fix

What it means

'Unable to sign in on this device' usually means Cash App's security stepped in — too many sign-in attempts, a login from a new device or location, or the phone number / email on the account no longer matches.
Cash App signs you in by texting or emailing a one-time code, so anything that stops you receiving that code (an old number, a full inbox, carrier filtering) ends up here too.
It's almost always recoverable through support, but it can take a little patience.

Affected Models

Cash App on iPhone (iOS)
Cash App on Android
Cash App on a new or reinstalled device
Cash App on web (cash.app) sign-in

Common Causes

Too many failed sign-in attempts — a temporary lock
Signing in on a new device or from an unfamiliar location
Phone number changed and not updated on the account (you can't get the code)
Email address full, mistyped, or sending the code to spam
Carrier blocking the verification text
Outdated app, or a glitch that a reinstall clears
Account flagged or restricted for review

How to Fix It

Wait, then request a fresh code.

If you've tried several times, stop for 30–60 minutes — repeated attempts extend the lock.
Then request a new login code and enter it promptly; codes expire quickly.
Check your text messages and your email spam folder for it.
Try your other contact method.

If the SMS code never arrives, choose to receive the code by email instead — or the other way round.
Make sure you're using the exact phone number or email tied to the account; a typo or an old number is the usual reason the code doesn't show up.
Update or reinstall the app.

Install the latest Cash App update.
If it still won't accept the code, delete the app and reinstall it, then sign in fresh — that clears a corrupted local state that can block sign-in.
Check your phone number and carrier.

If you got a new number, you'll need Cash App support to move the account to it — the app can't text a code to a number you no longer have.
If you still have the number but texts aren't arriving, ask your carrier whether short-code messages are being filtered.
Contact Cash App support.

From the app (or cash.app/help), start a support request and explain you can't sign in.
They can verify your identity another way, update the number or email, and lift a security lock.
Use only the official in-app support — scammers impersonate Cash App 'support' constantly, and real staff will never ask for your PIN, sign-in code, or full card number.

Frequently Asked Questions

I changed my phone number — how do I get into my Cash App?

You'll have to go through Cash App support, because sign-in relies on a code sent to the number (or email) on file and the app can't text a number you've given up.
Open the app or go to cash.app/help, request support, and tell them you've changed numbers; they'll verify your identity and update the account.
Have your old number, your email, and details of recent transactions ready to prove the account is yours.