[sirhawkeye]

Is there a way to ensure that the S5 will use only wi-fi for downloading content from Play Store, and other data-intensive services, but only use cellular data for things like phone calls and text messages? I want to leave wi-fi on all the time, along with the cellular service, but want to make sure that for large downlading (apps, content) it only uses my wi-fi and not my cellular data. Is there a way to ensure this and premanently set it? The phone has 4.4.2 KitKat on it and it's from Verizon Wireless.

[migewibro]

There is the option to turn mobile data off. This will only leave calls, voicemails, and texts coming through your carrier's network.
(Settings > Data Usage (Slide to off.))

Alternatively you can go to the Play Store > Settings > Look in the "General" section for "Auto-update apps" can be set to Wi-Fi only.