The iXTRA Folio Case does everything you want in an iPhone case: Storage, Battery Life, and — most of all — adds a 3.5 mm jack. It just has a weird little thing about making you use an app. Check out MrMobile’s hands-on and visit the Kickstarter page. This may be the best-priced case for all your needs.
Thank you for your visit on this page The iXTRA Folio Case: The ‘Perfect’ iPhone Case