the United States, Clearwire offered 4G fixed and mobile Internet access under the CLEAR brand in 88 cities. Clearwire claimed an average download speed of 3 to 6 Mbit/s with bursts over 10 Mbit/s. In January 2011, Clearwire started offering 4G WiMax service in Spain under the Instanet brand, discontinuing services based on Motorola Expedience technology. Clearwire provides service in Spain in the 3.4–3.6 GHz frequency range. Clearwire offered 4G WiMax service in Belgium under the Clearwire brand. Expedience fixed wireless Clearwire offers Expedience based services in 17 markets in the United States and in certain markets in Belgium. Customers can choose either the Motorola Expedience Residential Subscriber Unit (RSU) or the Motorola Expedience PC Card in both a PC Card and ExpressCard. The RSU incorporates automatic adaptive modulation for increased throughput and network capacity. Users are connected to the Internet at indoor locations throughout the entire system's coverage area. The unit functions as an Ethernet bridge (Layer 2) device, interfacing a standard Ethernet over twisted pair connector. The PC Card incorporates the same automatic adaptive modulation for increased throughput and network capacity with the added portability of a laptop CardBus card. Clearwire formerly offered Expedience-based services in Ireland and Denmark until operations in those countries were purchased by Imagine Communications and ERLO Group, respectively. In January 2011 Clearwire discontinued services based on Motorola Expedience technology in Spain in favor of Instanet branded 4G WiMAX service. VoIP Clearwire also offers its own Voice over IP service in some areas for an additional monthly fee. Wholesale products and services Sprint Corporation (Clearwire's parent company) resold Clearwire's 4G network service as Sprint 4G WiMax in over 70 markets across the United States. Other Clearwire investors Comcast and Time Warner Cable resell Clearwire's 4G mobile broadband service in a number of markets, including New York City, Los Angeles, Chicago, Philadelphia, Atlanta and Portland among others bundled with their cable, home phone, and residential Internet services. On June 4, 2010, Sprint Nextel introduced the first commercially available 4G cellphone in the U.S., the HTC EVO 4G. The device combines Clearwire's 4G network with Sprint's 3G network and Google's Android operating system, creating a multimedia-heavy device Sprint hoped would set it apart from 3G smartphones like the Apple iPhone. Criticism In 2005, Clearwire drew criticism from phone operator Vonage. Vonage claimed Clearwire and other ISPs were blocking Vonage's services. Testing showed that contrary to Vonage's