They seem to be using Citrix Netscaler, which has supported MPTCP for a little while: http://blogs.citrix.com/2013/05/28/maximize-mobile-user-experience-with-n

They seem to be using Citrix Netscaler, which has supported MPTCP for a little while: http://blogs.citrix.com/2013/05/28/maximize-mobile-user-experience-with-netscaler-multipath-tcp/ http://blogs.citrix.com/2013/05/28/maximize-mobile-user-expe... Disclaimer: I'm one of the authors of MPTCP, but I don't have any inside information from Apple, beyond what nmap tells us.