NOTE 4. SEGMENT INFORMATION Our segments are strategic business units that offer products and services to different customer segments over various technology platforms and/or in different geographies that are managed accordingly. We analyze our segments based on Segment Contribution, which consists of operating income, excluding acquisition-related costs and other significant items (as discussed below), and equity in net income (loss) of affiliates for investments managed within each segment. We have four reportable segments: (1) Business Solutions, (2) Entertainment Group, (3) Consumer Mobility and (4) International. We also evaluate segment performance based on EBITDA and/or EBITDA margin, which is defined as Segment Contribution excluding equity in ne t income (loss) of affiliates and depreciation and amortization. We believe EBITDA to be a relevant and useful measurement to our investors as it is part of our internal management reporting and planning processes and it is an important metric that managem ent uses to evaluate segment operating performance. EBITDA does not give effect to cash used for debt service requirements and thus does not reflect available funds for distributions, reinvestment or other discretionary uses. EBITDA margin is EBITDA divide d by total revenues. The Business Solutions segment provides services to business customers, including multinational companies; governmental and wholesale customers; and individual subscribers who purchase wireless services through employer-sponsored plan s. We provide advanced IP-based services including Virtual Private Networks (VPN); Ethernet-related products and broadband, collectively referred to as fixed strategic services; as well as traditional data and voice products. We utilize our wireless and wi red networks to provide a complete communications solution to our business customers. The Entertainment Group segment provides video, internet, voice communication, and interactive and targeted advertising services to customers located in the United Stat e