from Hacker News

Ask HN: How does this bank delete a sent SMS?

by laurensr on 2/2/23, 12:39 PM with 7 comments

• by t8sr on 2/2/23, 12:58 PM

  You send a second SMS with the same PID and it’ll overwrite the first one. It’s in the GSM standard and described on Wikipedia: https://en.wikipedia.org/wiki/GSM_03.40

• by laurensr on 2/2/23, 12:39 PM

  This Belgian bank sends new pin codes by SMS. Phones delete them after 2 days. How is this achieved?

• by fIREpOK on 2/2/23, 12:50 PM

  Not sure but they don't automatically delete any of my SMS (pin codes or not) here in the US