You need a full PC or Mac to use desktop software. You cannot use desktop software on a mobile device like an iPhone or iPad.
[edited to explain further-]---the mobile app is online software. It not possible now to use any online TurboTax software. Online tax preparation and e-filing are permanently closed. In order to complete your 2018 return you need desktop software--the CD version or the download, which must go on the hard drive of a full PC or Mac. That software cannot be supported/installed/downloaded on a mobile device.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
