UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A INFORMATION

PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE SECURITIES
EXCHANGE ACT OF 1934

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o Preliminary Proxy Statement

o Confidential, for Use of the Commission Only (as Permitted by Rule 14a-6(e)(2))

o Definitive Proxy Statement

þ Definitive Additional Materials

o Soliciting Material Pursuant to §240.14a-12

USA MOBILITY, INC.

(Name of Registrant as Specified In Its Charter)

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IMPORTANT ANNUAL MEETING INFORMATION Stockholder Meeting Notice Important Notice Regarding the Availability of Proxy Materials for the USA Mobility, Inc. Stockholder Meeting to be Held on May 18, 2011 Under Securities and Exchange Commission rules, you are receiving this notice that the proxy materials for the Annual Stockholders’ Meeting are available on the Internet. Follow the instructions below to view the materials and vote online or request a copy. The items to be voted on and location of the Annual Meeting are on the reverse side. Your vote is important! This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. We encourage you to access and review all of the important information contained in the proxy materials before voting. The proxy statement and annual report to stockholders are available at: www.envisionreports.com/usmo Easy Online Access — A Convenient Way to View Proxy Materials and Vote When you go online to view materials, you can also vote your shares. Step 1: Go to www.envisionreports.com/usmo to view the materials. Step 2: Click on Cast Your Vote or Request Materials. Step 3: Follow the instructions on the screen to log in. Step 4: Make your selection as instructed on each screen to select delivery preferences and vote. When you go online, you can also help the environment by consenting to receive electronic delivery of future materials. Obtaining a Copy of the Proxy Materials — If you want to receive a paper or e-mail copy of these documents, you must request one. There is no charge to you for requesting a copy. Please make your request for a copy as instructed on the reverse side on or before May 9, 2011 to facilitate timely delivery. 01AF1D

Stockholder Meeting Notice USA Mobility, Inc.’s Annual Meeting of Stockholders will be held on May 18, 2011 at The Westin Alexandria, 400 Courthouse Square, Whitney Room, Alexandria, VA, 22314 at 9:00 a.m. local time. Proposals to be voted on at the meeting are listed below along with the Board of Directors’ recommendations. The Board of Directors recommends a vote FOR all the nominees listed, FOR Proposals 2 and 3 and every ONE YEAR for Proposal 4: 1. Election of Directors. 01 — Nicholas A. Gallopo02 — Vincent D. Kelly 03 — Brian O’Reilly 04 — Matthew Oristano 05 — Samme L. Thompson 06 — Royce Yudkoff 2. Ratification to appoint Grant Thornton LLP as the Company’s independent registered public accounting firm for the year ending December 31, 2011. 3. Say on Pay — An advisory vote on the approval of executive compensation. 4. Say When on Pay — An advisory vote on the approval of the frequency of stockholder votes on executive compensation. 5. In their discretion, the proxies are authorized to vote upon such other business as may properly come before the meeting or any adjournments thereof. PLEASE NOTE — YOU CANNOT VOTE BY RETURNING THIS NOTICE. To vote your shares you must vote online or request a paper copy of the proxy materials to receive a proxy card. If you wish to attend and vote at the meeting, please bring this notice with you. Here’s how to order a copy of the proxy materials and select a future delivery preference: Paper copies: Current and future paper delivery requests can be submitted via the telephone, Internet or email options below. Email copies: Current and future email delivery requests must be submitted via the Internet following the instructions below. If you request an email copy of current materials you will receive an email with a link to the materials. PLEASE NOTE: You must use the number in the shaded bar on the reverse side when requesting a set of proxy materials. Internet — Go to www.envisionreports.com/usmo. Click Cast Your Vote or Request Materials. Follow the instructions to log in and order a paper or email copy of the current meeting materials and submit your preference for email or paper delivery of future meeting materials. Telephone — Call us free of charge at 1-866-641-4276 using a touch-tone phone and follow the instructions to log in and order a paper copy of the materials by mail for the current meeting. You can also submit a preference to receive a paper copy for future meetings. Email — Send email to investorvote@computershare.com with “Proxy Materials USA Mobility, Inc.” in the subject line. Include in the message your full name and address, plus the number located in the shaded bar on the reverse, and state in the email that you want a paper copy of current meeting materials. You can also state your preference to receive a paper copy for future meetings. To facilitate timely delivery, all requests for a paper copy of the proxy materials must be received by May 9, 2011. 01AF1D