No, you can't do full sensor readout at 960fps. You can only do 960fps by shooting at 2MP and keeping only 8 bits of data per pixel (or even less). Full sensor readout rates on phones are closer to 20-30 fps IIRC. And even that comes with caveats (no exposure adjustment, shutter speed must be faster than a certain amount, etc..). And that's at the low resolutions phones have. And then when you start hitting the limits of readout speed you start increasing rolling shutter issues and so on.