My keyboard (Google keyboard set to English (US)) has the British Pound (currency) symbol grouped with the Dollar sign. All I need to do is long-press '$' and I get ₱, €, ¢, £, and ¥.
On the LG keyboard, it shows up directly underneath the zero at the top right corner of the keyboard after switching to the symbol page (tap the button with the smiley face, 1 and the other symbol known as the pound sign (#) at the bottom left corner).