You may be familiar with the fact that, when typing on iOS, you can press and hold the . (period) key, or the .com key, to get a popup with a handful of top-level domains, such as .com, .org, .edu, etc. If your iOS device is set up with a country other than the US, you'll have these, plus others, such as .co.uk if you're in the UK, or .de if you're in Germany.
OS X Daily recently pointed out that you can also quickly type other top-level domains by simply adding international keyboards to your iOS device. To do this, go to Settings > General > International > Keyboards, then tap on Add New Keyboard. Tap the keyboard for the country you want to use. When you next go to type text, you can press and hold the . (period) key in, say, Mail, or the .com key in Safari, and access additional top-level domains.
Interestingly, when I did this, I found a surprising change. I added a UK keyboard to be able to type .co.uk easily, since I've just moved to England. I dictate a lot into my iPhone - much quicker than typing - and found that iOS was no longer recognizing "period" as a . but would type out the word. It would, however, type a . when I said "full stop." This shouldn't happen, because my iPhone is set with Voice Control to English (United States). Removing the UK keyboard fixed the dictation issue.
Mac OS X Hints
http://hints.macworld.com/article.php?story=20130423033116592