It's not possible anybody can conceal a message conversation, as a result of in the event that they delete the SMS messages instantly, you can definitely nonetheless see them on the system.
Kuba ubani engenakwenzeka ekwazi ukucasha ingxoxo umlayezo, ngoba uma ususa imiyalezo ye-SMS ngokushesha, ungakwazi Ngokuqinisekile namanje bheka them on the system.