Requirements
Before you can even download Pokemon GO, your Cell Phone must meet certain requirements for its gameplay. Obviously, you must have a smart phone in order to both download and play Pokemon GO. On top of this, if you aren't connected to some form of wireless internet, you won't be able to play either. Again, since Pokemon GO is a mobile phone app, this should be expected of it.
iPhone (iOS) Specifications Needed:
GPS Locating Services
iOS 8.0+
Compatible with iPhone 5 onwards
Internet Connection (LTE, 3G, 4G, Wi-Fi)
Android Specifications Needed:
GPS Locating Services
Android 4.4+
Preferred Resolution 720x1280 Pixels
Internet Connection (LTE, 3G, 4G, Wi-Fi)