Do any Iphones have Dual Frequency GNSS support?

Do any Iphones have Dual Frequency GNSS support so that Satellites from GLONASS, QZSS, BeiDou, and Galileo can produce higher accuracy GPS information ? It isn't clear to me from the Specs. And if not will this be added to later Iphones? I like Iphones but may have to switch to competitors if this isn't added soon.