usage of wifi on iphone

There is no need to turn off the wi-fi because once the phone is sleep mode (either from the timer or the power button), The wifi is automatic turned off. When the phone comes out of sleep mode, the phone will re-establish the wi-fi connection again. You can try this by putting the sleep mode for 30 sec and put it back on. The wifi signal strengh is lost and re-establish after a few seconds.
 
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