Mobile app
On a phone, open /mobile/ and sign in. You get the worksheets already on your account. The layout is a single column; the full ribbon is on a wider screen or desktop.
What you can do
- Open a sheet from your account and read the calculation.
- Edit math and text on a narrow canvas — expect less room for plots and frames.
- Evaluate and save; changes sync back to the account (and to the desktop app in cloud mode).
For a long sheet with a 2D frame or several plots, use the desktop app or a wide browser window. The phone layout is for review and small edits. Sign in with the same account so saved sheets sync back.