Non-GAAP operating margin is defined as non-GAAP operating income divided by revenues.

ENGADGET: Google's Q4 2011 results: $2.71 billion profit, $8.13 billion in revenue, Wall Street disappointed

Fitch said Nokia needs to stabilize revenues and be capable of generating low-single digit non-IFRS operating profit margins and positive pre-dividend free cash flow, if it is to affirm the current rating.

FORBES: Nokia Debt Rating Downgraded To Junk Status Buy Fitch

Wireless operating income margin was 30.8 percent and segment EBITDA margin on service revenues (non-GAAP) was 49.0 percent, both record highs.

ENGADGET: Verizon issues Q2 earnings, touts $15.8 billion service revenues in Wireless

In fourth-quarter 2012, wireless operating income margin was 24.0 percent and segment EBITDA margin on service revenues (non-GAAP) was 41.4 percent, down 80 basis points from fourth-quarter 2011.

ENGADGET: Verizon adds 'record-high' 2.1 million subscribers in Q4 2012, but still makes a loss