iPhone -- http://www.everymac.com/systems/apple/i ... specs.html
The size and placement of the message screen has been pretty consistently wonky, possibly because I use the Swype custom keyboard. Eventually the top part of it got so high it couldn't be accessed any more, and the top 3-4 of my conversations were hidden. Restarting my phone fixed this, but that's not an ideal way to deal with this bug.
Also, as a side thing--the game runs a bit slow at times. Like, in the 36ish hours we've been playing so far, the game has locked up maybe 3 or 4 times? (6 person game)