If you're accessing TurboTax Online on your phone through a web browser instead of from a computer, you'll have the option to snap a photo without using the TurboTax mobile app.
To manually enter your W-2:
If you don't have your employer's EIN or prefer to skip the import options, you can manually enter the info from your W-2 instead. Follow Steps 1-3 above. At Step 4, if you can't import your W-2 or if you select Continue without entering an EIN, you'll come to Let's type in the rest of your W-2 info screen where you can manually enter your information.