Palm Treo/Pre and BlackBerry users! And probably Clicks users too. It's not a matter of "Does Russian language use the Latin script?" (it doesn't), but rather "What is the least annoying method to input Cyrillic on a BB-style keyboard, which doesn't have enough buttons for the йцукен layout?". Phonetic layouts such as яверты or яшерты were very popular for such devices back in the day.

For anyone one confused, the first part is an approximate transliteration into Cyrillic of the English sentence “Much like how you can/could spell English in Cyrillic.”