Why does Android not have undo feature and other issue..

I accidently pasted over text by accident in documemt and couldn't undo it like in ios or even in windows. Also whenever I try to restore apps in initial setup galaxy s7 I get a message everytime saying "unfourtanetly t mobile has stopped working". Very strange error bug message and don't get me started with t mobile, their coverage in my area sucks it is awful, not as bad as sprint though.

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