FRONTIER COMMUNICATIONS CORPORATION (Exact name of registrant as specified in its charter) Delaware 06-0619596 (State or other jurisdiction of (I.R.S. Employer Identification No.) incorporation or organization) UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2018 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF ...