On an iPhone 15 using Safari, the voice mode transcription is so bad as to be unusable. It is extremely slow, will often pick up only the first word of a sentence, and whatever it generates is pretty much always incorrect.
I shared a video of me saying, "Why is the sky typically blue?", and after 8s of processing the prompt was "Why escape".
Video here: https://discord.com/channels/1256077108111868035/1289302327387226235/1289312784915501067
I've tested Bing's voice mode in both Safari and Firefox on an iPhone 15, and the transcription is perfect.
Voice transcription should mostly accurately reflect what was said verbally