Constraints on the curvature and rms lensing deflection angle from Planck TT+lowP CMB power spectra (samples, colour coded by the value of the Hubble constant), showing that the closed-universe models favoured at the 2σ level have high lensing power that is inconsistent with the lensing reconstruction result. The combined lensing result (black contours) is much tighter, and provides additional information on top of the constraint when adding BAO data (red contours); both joint constraints, and the combined filled contours, are consistent with a flat universe.