A:AnswerTechnically speaking, voice audio is mono and the Bose earbuds are playing it back in just one channel. The Buds+ will play the mono audio in both the left and right earbud so you'll hear it in "stereo." I don't like the way Bose did it but the Buds+ will playback audio calls in both earbuds.
A:AnswerYes the galaxy buds + are compatible with iPhone. I own one myself and have no issues at all when pairing my iPhone. Battery life is great, I get 2 work days without charging them. May I add you can answer calls by tapping the bud which is a bonus for me.
A:AnswerYes but does not switch to the other device automatically. Example I have my buds plus paired to personal phone Galaxy S9+ and work phone iphone8. If I am listing to podcast on Galaxy and iPhone rings I would need to click the buds in Bluetooth settings to answer call on buds plus on iphone. Then click buds plus on Galaxy Bluetooth settings to go back to podcast on the galaxy. You do not have to unpair. I have herd that if the two devices are Samsung it will switch automatically. Example Samsung phone and tablet or computer it will go to the call then back again automatically with out Bluetooth settings.