I have a Czech friend whose name is Jiří, and I want to add his name to my Contacts. Pressing and holding R on the iPhone keyboard does not show any special character versions (and similarly on OSX, holding R doesn't show anything. I found the character in Special Characters on OSX.)
How can I add his name to my iPhone contacts? More generally, how do you get access to general special characters on the iPhone? I don't know of any Special Characters equivalent app or functionality accessible through the keyboard, but I would guess there must be a way somehow.