; (2) in subparagraph (F), by striking calls made in violation and inserting violations ; and (3) in subparagraph (G)— (A) by striking short-duration calls and inserting short-duration calls or high-volume, unlawful text messages ; and (B) by striking calls made in violation each place it appears and inserting violations . (g) Information sharing Section 227(i) of the Communications Act of 1934 ( 47 U.S.C. 227(i) ) is amended— (1) by striking paragraph (2); (2) by striking Sharing and all that follows through Not later than and inserting Sharing.— Not later than ; and (3) by redesignating subparagraphs (A) and (B) as paragraphs (1) and (2), respectively (and conforming the margins accordingly). (h) Robocall blocking service Section 227(j) of the Communications Act of 1934 ( 47 U.S.C. 227(j) ) is amended— (1) by striking paragraph (2); (2) by striking Service and all that follows through Not later than and inserting Service.— Not later than ; (3) by redesignating subparagraphs (A), (B), and (C) as paragraphs (1), (2), and (3), respectively (and conforming the margins accordingly); and (4) by redesignating clauses (i) and (ii) as subparagraphs (A) and (B), respectively (and conforming the margins accordingly). (i) Regulations Not later than 270 days after the date of the enactment of this Act, the Commission shall promulgate regulations to implement this section, including the amendments made by this section. 102. Text message authentication and trace back study (a) Study The Commission shall conduct a study to determine the feasibility of— (1) creating an authentication framework with respect to text messages