Can I use volume key to PTT on iPhone?

As of v3.5, this function is no longer available.

Apple requested we remove the feature, stating volume button mapping violates their terms of use.  If you feel this function is useful and would like it reinstated, please contact Apple Support and voice your opinion.

https://www.apple.com/support/

Map external hardware buttons

1. Use your iPhone/iPod/iPhone wired headset.

Enable "Headset/remote control" and change the push to talk action to "Toggle mode" to use the buttons on your apple headset to PTT in the foreground and the background.

2. Zello certified devices for true push to talk mode

To see a list of devices you can use as true push to talk, please see Zello compatible devices. 

Questions? Submit a new ticket for support-related inquiries.