5. Data ARPU is defined as total data revenues divided by average total customers during the period, rounded to the nearest ten cents. Total data revenues include data revenues from contract customers, prepaid customers, Wi-Fi revenues and data roaming revenues. Branded data revenues exclude data revenues from M2M customers, MVNO, Wi-Fi revenues and data roaming revenues. The relative value of data revenues from bundled unlimited voice and data plans (including a relative value for messaging and non-messaging data revenue) are included in total data revenues.
6. Operating Income Before Interest, Depreciation, Amortization and Impairment (“OIBDA”) is a non-GAAP financial measure, which we define as operating income before depreciation, amortization and impairment charges. In a capital-intensive industry such as wireless telecommunications, we believe OIBDA, as well as the associated percentage margin calculation, to be meaningful measures of our operating performance. OIBDA should not be construed as an alternative to operating income or net income as determined in accordance with GAAP, as an alternative to cash flows from operating activities as determined in accordance with GAAP or as a measure of liquidity. We use OIBDA as an integral part of our planning and internal financial reporting processes, to evaluate the performance of our business by senior management and to compare our performance with that of many of our competitors. We believe that operating income is the financial measure calculated and presented in accordance with GAAP that is the most directly comparable to OIBDA. OIBDA is adjusted to exclude transactions that are not reflective of our ongoing operating performance and is detailed in the Reconciliation of Non-GAAP Financials Measures to GAAP Financial Measures schedule.
7. Adjusted OIBDA margin is a non-GAAP financial measure, which we define as adjusted OIBDA (as described in Note 6 above) divided by service revenues.
8. Capital expenditures consist of amounts paid for construction and the purchase of property and equipment.