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https://animoto.com/blog/news/hd-video-creation-sharing

''''''' 360p

Videos at 360p are well-suited to smartphones and other mobile devices since they use up less data, but may appear a bit blurry on larger screens. ...

1080p

For an even higher resolution, you can download your videos at 1080p, another favorite for HD television stations. We recommend this resolution for sharing on social media or for showing videos on larger screens and TVs, since it’ll give your audience the highest possible quality display, with crystal clear playback. '''''''
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Watching videos at 1080p instead of 360p on a 6" screen smartphone does not give a big visual advantage. OTOH, watching videos at 360p instead of the optimum 1080p on a 39" screen TV gives a big visual disadvantage, ie very blurry videos.
....... Similarly, watching videos at 1080p instead of the optimum 2160p/4k on a 60" screen TV gives a big visual disadvantage, ie blurry videos.
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I streamed and watched the above Youtube MV at 360p on my 6" mid-end Honor 7X smartphone, the video is clear and without any empty pixel boxes = watching it at 1080p or 720p does not give a big visual advantage = mostly a waste of bandwidth speed and data consumed.
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depend on your phone screen resolution also, if 720p then ok lor, if full HD or higher, then you gonna see pixelated picture 

I will not tolerate anything below 720p. 720p is my minimum requirement.

Khuan0813
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The screen resolution of most Android smartphones can be lowered, eg if the default highest screen resolution is giving problem during video-streaming, especially during live video-streaming and Zoom conference live video-calls. .......

https://www.androidcentral.com/how-change-y...nd-refresh-rate - 29 Jan 2020

''''''' How to change your phone's resolution

Whether you already have one of the aforementioned phones, or you're gearing up for the upcoming Galaxy S20 and its rumored 120Hz WQHD+ display, lowering your phone's resolution is a quick and simple process. Just bear in mind that the exact steps will differ a bit depending on what kind of phone you're using — we're using a Galaxy Note 10+ for the sake of this guide, but the steps are generally the same across the board.

    Open the Settings app.
    Tap Display.
    Tap Screen resolution.
    Choose your desired resolution. Generally speaking, the higher the resolution, the sharper your text will be, along with the accompanying battery drain.

Another important thing to note is that not every phone supports reduced resolutions. The smaller Galaxy Note 10, for example, can't be configured up or down from its default FHD+ (2280x1080) resolution. '''''''

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https://www.techradar.com/sg/news/phone-and...promise-1282880 - 4K smartphone displays require big battery life compromise - January 30, 2015

''''''' "For the large screen 4K is very good, but on a smaller smartphone display our eyes may not be able to see the difference between this and 2K resolutions.

"4K requires a lot of power, so if you use it you need to make compromises. A 4K display on a smartphone will give you half a day of battery life, but a 2K display can give you over a day of usage from a single charge." '''''''

I think 4k/2160p displays are also very taxing on the phone's processors and RAM = require high-end or flagship phone specifications.
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I don't understand why wanna do that when our phone and Internet are capable of? Please, OK?

No need wall of words here... Just use whichever you prefer and I will definitely stick to the highest resolution because my phone can.

I agree that why should anyone views a video quality less than 1080p quality if that is available unless you need to save on data. 360p just doesn’t cut it anymore in 2020