"The latest iOS 9 beta builds came with other small improvements, including Wi-Fi calling for AT&T and a "Wi-Fi Assist" mode that automatically switches to cellular data if it determines a local network signal is too weak."
Yes - this should be feasible as Apple Music switches seemlessly for me between wifi and cellular.
Very impressed with this,btw. I suspected I would have to change manually as I went out of range. No break in the song, no lag.
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