The Pocophone F1 by Xiaomi is an ultra-budget phone about $289 USD on some places for the 64GB model which feels anything but cheap. It has a 4000mAh battery, 6GB of RAM, dual cameras and a Notch screen all powered by a Snapdragon 845. Now the software updates will include a 960fps mode in 1080p for a very short rec time. Some initial tests put it at 25MB in size which might be about 0.2sec.
So you get a phone that also will shoot the 4k 60fps spec with the update but what about the video quality? Actually, it is not that bad and quite competitive with some mid-range phones. It will not be flagship quality like those $800 USD + phones but it will get the job done. When it comes to slow motion 120 and 240fps 1080p mode it does lower quality quite a bit which may be a preview of the quality that the 960fps mode will deliver.