When a service asks to verify your number again
The account worked for months, then asked for the original number. Whether that is fixable comes down to one detail in the prompt — here is how to read it.
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Troubleshooting
How the numbers work, why codes go missing, and what the catalogue figures actually mean. Written by the people who run the rail.
Why your verification code never arrived
Seven reasons a code does not land, in the order worth checking. Most of them are fixed in under a minute, and none of them cost you anything.