I need to charge up my phone proextender user reviews The $229 base model comes with 16 gigabytes of storage. For $40 more, or $269, you get twice the storage. Both will go on sale in the U.S. next Tuesday. A 32-gigabyte model with 4G cellular capability will cost $349. By contrast, the iPad Mini starts at $329. A 32-gigabyte version with 4G costs $559.