Codes not arriving
App-by-app fixes when the verification SMS never shows up.
WhatsApp verification code not arrivingWhatsApp says it sent the SMS but nothing comes: wrong country, VoIP rejection, resend limit, the one-hour timer, and how to switch to a number that works.
Google verification code not receivedGoogle refused or did not deliver the SMS? It is usually a VoIP rejection or a used-up number. What Google checks, which countries pass, the fix.
Discord phone verification failedDiscord asks for a phone number to join servers or after a flag, and refuses VoIP. Which numbers pass, why it says invalid phone number, how to verify fast.