How to just use Wi-Fi when downloading apps on Iphone 5s?

I have straight talk and just got it yesterday and already use 500 mb? Wtf i haven't even used it a lot when i'm not connected to Wi-Fi. I'm so confused

Is your phone connected to home Wi-Fi?
Turn Wi-Fi assist off (in settings, cellular)
Also turn off cellular for high use apps line iCloud, iTunes and App Store.

Turn your data off. Leave it off unless you need to do something when you are not at home. Then turn it off as soon as you are done using it.

Turn on your Wi-Fi. Turn it off when you are done downloading the apps and games you want to download. Then turn it off again when you are done.

Even if you are not using your data, if it is turned on, your phone will use data. Your phone will use data to automatically update games and to ensure that you have a data connection.

I use Net10 prepaid service. I never turn my data or Wi-Fi on, unless I'm using them. Then I turn them off as soon as I'm done using them. I don't want to use all of my data when my phone is just resting. Keeping data and Wi-Fi turned off also saves my cell phone battery life.

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