Rent Butter sends phone verification codes by SMS through a US-based service. If you're applying with a non-US phone number, you may have trouble receiving the code.
What's happening
Some carriers outside the US block short-code SMS messages from US senders, or charge extra fees that prevent delivery. Even when delivery works, it can be delayed by several minutes.
What to try
Wait longer — international SMS can take 5–10 minutes
Tap Resend Code after the cooldown ends
Check your spam or filtered messages
Contact your carrier to make sure short-code SMS isn't blocked on your line
If you have access to a US phone number
If you have a US phone (a friend's, family member's, or your own US-based number), use that number instead. The Resend Code link on the verification screen takes you back to phone entry where you can change the number.
If you can't receive the code at all
Contact your property manager — they can work with Rent Butter to manually verify you and move your application forward.