★★★Onthelarge-screenphone,thefunctionbuttonsareatthebottomofthescreen,Itmaybeharmfultoyourfingers,BackButtonallowsyoutomoreeasilyusethefunctionbuttons★★★
★★★Ifyourfunctionbuttonwasnotworking,BackButtoncansaveyourphone.★★
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Back Button
2.3.2for Android
Robust Programmer Inc
