I have all the meaningful OS's for phones. Haven't had an issue with BT streaming of audio. Both Android and iOS work just fine as well connected through USB. Tested perfectly with my HTC One m7, m8, m9. Samsung GS3, iPhone 3g, 4s, 6, iPad 3, iPad mini 2, Nexus 5, Samsung ATIV S (Windows Phone). If audio is you only concern, anything will work. I have yet to have the SMS inbox sync work with any iOS device, might be an iMessage issue. Works great on my android phones. I don't have a headset to test call quality two way, but answering calls and just listening was fine on all devices. I have a 15 RGS so the 6.5 system.