Wind noise going over microphone of the device will probably be an issue (I actually do have some experience with this). You'd have to take if off the mount and speak into it. Then you might drop it and you also might miss your turn cue if you are on the "phone" while following your course. <grin> Unless you are comfortable in a very aero time trial position, then you might be close enough for it's mic to pic you up well.
Why not just keep a BT earpiece with mic in your ear or in your pocket to pull out and use when you have to call someone while riding?
Last edited by Iride01; 07-05-21 at 08:53 AM.