The iPhone includes a keyboard with lots of Kaomoji emoticons you can use at the push of a button ヽ(^o^)

To enable it, go to Settings > General > Keyboard ( ͡° ͜ʖ ͡°)

Click Keyboards > Add New Keyboard > Japanese > Kana then hit Done ᕦ(ò_óˇ)ᕤ

Press the world icon to cycle through your keyboards until you reach Kana, you'll see a key labelled ^_^ bottom left

Press it to show the Kaomoji, then hit the arrow on the right to expand the view ಠ_ಠ

When you see the emoticon you want, click it (=^ェ^=)