So you want to add 4G capability to your iPad Mini with WiFi? The AT&T Modio 4G LTE Case can help. This LTE case also provides you with up to 32 GB of additional storage and up to 16 hours of wireless connection. It is also a normal case to protect your gadget from daily wear and tear.
The case has an external microSD card slot that accepts up to 32 GB of additional memory. The 4600 mAh battery should last you up to 16 hours. AT&T customers can add this case to their plan cheaply but you do have the option to purchase it without a contract for $199.