Exhibit 31.2

CERTIFICATION OF CFO PURSUANT TO SECTION 302

OF SARBANES-OXLEY ACT OF 2002

I, Jim McDevitt, certify that:

1. I have
reviewed this Report on Form 10-Q of Capital Growth Systems, 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 small business issuer as of, and for, the periods presented in this report;

4. The small business issuers other certifying officer 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) and internal control over
financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f) for the small business issuer 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 small business issuer, 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) Designed such
internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of
financial statements for external purposes in accordance with generally accepted accounting principles;

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

5. The small business issuers other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the small business issuers auditors and
the audit committee of small business issuers board of directors (or persons performing the equivalent functions):

(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 small business issuer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 small business issuers internal control over financial reporting.

Dated: November 14, 2008



By:

/s/ Jim McDevittName:

Jim McDevittTitle:

Chief Financial and Accounting Officer




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