The native calculator app for Android has a "Clean history" option, but I have no clue on how to see this history. I've tried swipe movements, clicked on every possible button and even to held down the menu button as described [here]( http://android.stackexchange.com/questions/19407/accessing-calculation-history-on-htc-calculator-app), but I could not make the on-screen keyboard show up. Anybody had more luck trying this? I am running Android 4.4. Screenshot: http://m.imgur.com/LiSogE5