If you are using the mobile app, then nothing is stored on your phone until you download the PDF file when you are finished your return. All the information is store on our secure servers.

If you would prefer to use your iPad instead of your phone, you can just uninstall TurboTax off your phone, and then install it on your iPad through the Apple App store. You can then use your same username and password to continue your return. https://itunes.apple.com/ca/app/turbotax/id1447566566?mt=8

Or you can login to TurboTax Online with the same info, and do your returns on a computer. https://ww1.2018.turbotaxonline.intuit.ca/