This app was mentioned in 2 comments, with an average of 1.00 upvote
https://play.google.com/store/apps/details?id=com.tdameritrade.mobile3&hl=en_US&gl=US
https://play.google.com/store/apps/details?id=com.devexperts.tdmobile.platform.android.thinkorswim&hl=en_US&gl=US
Direct links - from my iPhone lol