Exhibit 31.3

CERTIFICATION

I, Harry Roessner, Vice President of Accounting and Controller of SunCom Wireless, Inc., certify
that:

1. I have reviewed this quarterly report on Form 10-Q of SunCom Wireless, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such
statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other
financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrants other certifying officers and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act
Rules 13a-15(e) and 15d-15(e)) [omitted in accordance with Section III E. of SEC Release No. 34-47986 and SEC Release No. 34-51293] for the registrant and have:

(a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including
its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) [omitted in accordance with Section III E. of SEC Release No. 34-47986 and SEC Release No. 34-51293];

(c) evaluated the effectiveness of the registrants disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures as of the end of the period covered
by this report based on such evaluation; and

(d) disclosed in this report any change in the registrants internal control over
financial reporting that occurred during the registrants most recent fiscal quarter (the registrants fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the
registrants internal control over financial reporting; and

5. The registrants other certifying officer(s) and I have disclosed, based on our
most recent evaluation of internal control over financial reporting, to the registrants auditors and the audit committee of the registrants board of directors:

(a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrants ability to record,
process, summarize and report financial information; and

(b) any fraud, whether or not material, that involves management or other
employees who have a significant role in the registrants internal control over financial reporting.



|                   |  |                                                   
|------------------ |  | --------------------------------------------------
|Date: May 14, 2007 |  |                                                   
|                   | 
|                   |  | /s/ Harry Roessner                                
|                   |  | Name: Harry Roessner                              
|                   |  | Title: Vice President of Accounting and Controller