The le will trace any numbers they seize their phones. It happened to me one time on burner phone.
I recognized her number and knew she was in jail. I received a text from the, my guess, le saying "I miss you."
I responded back saying "I do not recognize that number and can I ask who this is?
The, again my assumption, le never responded back. Several days later, she was out and she received 2 of her phones back.
I showed her the correspondence and she was glad I responded in a naive way.
Risk comes with territory.