Thanks to the jailbreak tweak Safari Download Manager, your iPhone can download files more like a desktop web browser. Once installed, the tweak adds a highly-configurable download manager to the mobile Safari app.
Almost any type of file can be downloaded with Safari Download Manager. The destination folder can be chosen, and up to 10 files can be downloaded simultaneously in the queue. Your current downloads will be displayed with a status bar showing the current transfer speed, file size and percentage complete.
The tweak integrates a Download Target button to the options in Safari that appear when you hold down on a link. Safari Download Manager will even offer to open files using associated apps. Of course, not all file types are supported on the iPhone. This is why the package iFile is a perfect complement to Safari Download Manager. After all, you need to be able to view, unzip, share and manipulate all of these files on your iOS device. iFile is $2.00 off normal price with the purchase of Safari Download Manager.
Safari Download Manager is available on Cydia from the BigBoss repo for $5.00. Check here for instructions on how to jailbreak iOS 6.x with evasi0n. You can also find out how to purchase and install Cydia tweaks with this guide.