Gemm

I don't play many word games on my phone these days but some apps I tend to go back to are:

Puzzle Page (a variety of daily puzzles)
Red Herring (a category game)
Bonza/Bonza Planet (a weird kind of crossword thing)
7 Little Words (a crossword definition game)
4 Pics 1 Word (what it sounds like)

I don't pay to play these and so some are limited to one or two daily games, but I find they fill the time nicely when I don't have access to a computer :-)