State Minister for Post and Telecommunication Tarana Halim has said that all unregistered SIMs will be closed after May 31.She said this at a press conference held at her Secretariat office in the city on Sunday.Tarana said, 10.09 crore SIMs have been re-registered and 3. 30 crore SIMs are yet to be re-registered although the deadline expires May 31.