H+ - HSDPA Plus was the fastest data network currently supported by giffgaff before 4G was adopted, at around 21 Mb/s. In many versions of Android the full name, “H+”, is shown, but on later versions of Android this was simplified to just “H”. H+ allows you to easily stream HD videos, but Full HD content and higher is probably still off-limits unless you’re willing to wait for the inevitable buffering.
I actually remember this.