By default there is a world globe symbol next to the dictate button on the iPhone keyboard, the second key in from the left on the bottom row.  I sometimes press the world globe button when I want to press the dictate button. You can remove the globe button, here’s how.

Here’s what it looks like with the globe button:

Here’s what it looks like without it:

To remove it just go to ‘Settings’, ‘General’, ‘Keyboards’, then you will see a list of keyboards. Mine had 3 keyboards, ‘English’, ‘Emojoi’ and ‘Greek’

Click on ‘Edit’ then delete all the keyboards until only the English one is left.

Now the globe button will disappear.