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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/GS
by t8sr 4y ago
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 https://en.wikipedia.org/wiki/GSM_03.40
- 082349872349872 4y agoDid you mean the TP-MN (and TP-RD) fields by "same PID"?
- nulbyte 4y agoLooks like there is a TP-PID field that has values to indicate replace message: https://security.stackexchange.com/questions/19731/how-does-a-new-sms-message-overwrite-a-previous-one https://security.stackexchange.com/questions/19731/how-does-... I find this fascinating; I didn't know this functionality existed.
- 082349872349872 4y agoAha, not "same PID", but "special PID": https://en.wikipedia.org/wiki/GSM_03.40#Protocol_Identifier https://en.wikipedia.org/wiki/GSM_03.40#Protocol_Identifier (65-71) also potentially interesting: is there a no-notification ping? Sometimes I am glad I grew up in the fixed-line era. > Short Message Type 0 is known as a silent SMS. Any handset must be able to receive such short message irrespective of whether there is memory available in the (U)SIM or ME or not, must acknowledge receipt of the message, but must not indicate its receipt to the user and must discard its contents, so the message will not be stored in the (U)SIM or ME.