WiFi Not working at all, nor activate

Hey so i have two devices that the WiFi wont work on at all, my first one is a Samsung galaxy tab 10.1 v2, its the one i want to fix the most because i use it daily for movies and alike, except youtube and others because the WiFi wont turn on. The second is my old iPhone 4s, its not as important as the tablet but it would be nice to fix because my fathers current phone is extremely slow and it would be good for him until he buys a new phone. Which will take a while because hes really stubborn about those things

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