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

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: <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;GSM_03.40" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;GSM_03.40</a>

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

Not sure but they don&#x27;t automatically delete any of my SMS (pin codes or not) here in the US