The use of designated handset model(s) or device(s) are required for using 4.5G network service. Actual network service will be subject to and affected by the service locations, network circumstance, network coverage, hardware, software and other factors. China data roaming service is provided by China Mobile network; the service is not applicable to FTP, P2P applications (including BitTorrent, Peer Casting applications - including PP Stream, PPTV, etc).