Exhibit 10.30

Second Amendment to the Second Amended and Restated Limited Liability Company Agreement of HELIO LLC

This
Second Amendment to the Second Amended and Restated Limited Liability Company Agreement of Helio LLC is entered into on this 28th day of February 2008 (this
"Second Amendment") by and between SK Telecom USA Holdings, Inc., a Delaware corporation, EarthLink, Inc., a Delaware corporation,
Helio, Inc., a Delaware corporation, and HELIO LLC, a Delaware limited liability company (the "Operating Company"). All capitalized terms
used in this Second Amendment and not otherwise defined herein shall have the meanings ascribed to them in the Agreement, as defined below.

RECITALS

WHEREAS, the parties hereto entered into the Second Amended and Restated Limited Liability Company Agreement of Helio LLC, dated November 12, 2007,
and subsequently entered into an Amendment to the Second Amended and Restated Limited Liability Company Agreement of HELIO LLC, dated November 16, 2007 (hereinafter referred to
collectively as the "Agreement"); and

WHEREAS,
the parties hereto mutually desire to clarify and adjust the impact of certain events on the rights and obligations of the Members of the Operating Company as described in the
Agreement.

NOW,
THEREFORE, in consideration of the mutual covenants herein contained, and for other good and valuable consideration, the parties hereto agree and amend the Agreement as follows:

ARTICLE 1
DEFINITIONS

1.1Amended Definitions.For purposes of this Second Amendment
and the Agreement, as amended, the following terms shall have the meanings set forth beside them in this Section 1.2 in lieu of the meanings set forth beside such terms in the Agreement:



---



1.2Additional Definitions.For purposes of this Second
Amendment and the Agreement, as amended, the following terms shall have the meanings set forth beside them in this Section 1.1:



2

---





ARTICLE 2
EFFECT OF TRIGGERING EVENTS

2.1Sale of Operating Company.Section 4.7 of the
Agreement is hereby deleted in its entirety and replaced with the following:



3

---





2.2Distributions.The introduction to
Section 11.1 is hereby deleted in its entirety and replaced as follows:



2.3Winding Up.Section 13.4 of the Agreement is hereby
deleted in its entirety and replaced with the following:



ARTICLE 3
AFFIRMATION OF TERMS

3.1Effectiveness.This Second Amendment shall be valid and
effective on and from February 28, 2008. All of the other terms and conditions of the Agreement, unless otherwise expressly amended herein, shall remain in full force and effect.

SIGNATURE PAGE FOLLOWS

4

---



IN WITNESS WHEREOF, the parties hereto have caused this Second Amendment to be executed by their duly authorized representatives as of the date first written in this Second
Amendment.

| | EARTHLINK, INC.              
| | -----------------------------
| |                              
| | Name:
Title:                 
| | SK TELECOM USA HOLDINGS, INC.
| |                              
| | Name:
Title:                 
| | HELIO, INC.                  
| |                              
| | Name:
Title:                 
| | HELIO LLC                    
| | By: Helio, Inc.
Its: Manager 
| |                              
| | Name:
Title:                 

5

---



QuickLinks