We present and evaluate dynamic adaptations for mobile touch GUIs. They mitigate reachability problems that users face when operating large smartphones or “phablets” with a single hand. In particular, we enhance common touch GUI elements with three simple animated location and orientation changes (Roll, Bend, Move). Users can trigger them to move GUI elements within comfortable reach. A lab study (

$$N=35$$ ) with two devices (4.95 in, 5.9 in) shows that these adaptations improve reachability on the larger device. They also reduce device movements required to reach the targets. Participants perceived adapted UIs as faster, less exhausting and more comfortable to use than the baselines. Feedback and video analyses also indicate that participants retained a safer grip on the device through our adaptations. We conclude with design implications for (adaptive) touch GUIs on large devices.