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When to use wifi? well i use my wifi at my place because i get horrid 3g signal and voice quality. The reason is when you have bad signals you're phone uses battery to hold the signal or look for another tower which uses a lot of battery. Using wifi will only require the phone to stay on one signal so it does not use battery to look for another tower and such. And it does not Affect Phone calls nor text messages from what i seen. But if you have 4g LTE faster than you're wifi then nah don't use the wifi, it is totally up to you.
Originally Posted by obidos