Some Inkling titles have so much interactive content that they can be very large! This is why we suggest using Wi-Fi on your device for downloading titles on Inkling, since it's usually faster and more reliable than using a cellular 3G/4G/LTE connection.
To find out which type of network you are on, look in the upper left corner of your device.
If you see 3G or 4G/LTE, you're connected via a cellular network. If you see Wi-Fi signal bars, you're connected via Wi-Fi.