"I don't use the mobile unless its necessary. Don't use the mobile phone unless you have no other option," Mulayam said while addressing book release authored by IAS officer Aradhana Shukla's children.
The SP supremo said that the technology could be "misused".
"You don't know whether your conversation is being tapped," he said.
Mulayam's statement could have came in backdrop of suspended IPS Amitabh Thakur's allegation that the former threatened him on phone in July.