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To keep your phone from Dialing the last person that you sent a text to....
Settings > Advanced Features > Motions and Gestures > Direct Call. Turn this OFF
To keep your phone from Dialing or activating features while in your pocket...
Settings > Display > Accidental Touch protection and turn this ON.
I have never turned the Direct call feature on. EVER. But after my update, this feature was turned on. Simple check. Make sure that it's off. Check Both of them.
I had problems with Direct call until I turned it OFF. Haven't had a single dial since then.