How to access extended characters like the degree symbol on iPhone and Mac

Your physical or digital keyboards present a limited number of character options on the surface. However, there are a few ways to access accented letters, special characters, and more on iPhone, iPad, and Mac. An Apple keyboard The standard iOS keyboard gives you quick access to upper-case and lower-case letters, the standard numbers, punctuation marks, and characters. There is, of course, a plethora of other characters out there. You can choose from letters with umlauts to an upside-down questi...