Been using the ViaBus apk as we have move quite close to the main On Nut road,gives you all the buses numbers routes stops plus all the Songthaews.Not sure if it works else where in Thailand but has been useful to us to work out where the the public transport is going to.
https://play.google.com/store/apps/d...ransitia&hl=en
https://itunes.apple.com/th/app/viab...074208600?mt=8