Press and hold it there

There are quite a few hidden features in the iPhone which is not quite obvious at first glance. One of the most "common" hidden feature is "Press and hold it there".

Why is that so? Basically, hidden options may appear if you press on a particular option and hold it there. Below are some of the key hidden features that I've found in the iPhone keyboard if you press and hold it there:

1. Globe: Direct hot key to the different languages that you have installed on your iPhone, including your emoji.
2. .com: Allows you to choose other "dots" like .sg, .us, .org, etc.
3. 0: Allows you to choose ⁰ (degree)

You can try to see if this extends to the other features offered by the iPhone. Who knows... You may find something interesting.