What this cable responsible for?
Wifi GPS laudspeaker dock and I think Mic works (I’ve tested it on Facetime with two iPhones close together)
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That is either main cellular or secondary wifi antenna.
The secondary wifi antenna goes to the front of the speaker, while the main cellular antenna goes to the dock flex.
Because wifi and cellular functions both has 2 antennas, all functions will seem to work with one disconnected, however you may experience poorer speed or signal strength after this.
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if that's true (would be great to have someone else who is 100% sure confirmation) that would explain why those things are working.
So basically that bottom antenna (plastic strip at back) is not connected - because I see good WiFi and Cellular connection - I can live with that :)
I thought it can be that well-known iPhone 7 audio IC problem
by Bart