This question is different from (Connect Pi to an old laptop screen) because I will use a cellphone and not a laptop.
Would the Raspberry Pi support a LCD screen that is taken out of a cellphone?
Hackaday.com: USING CELL PHONE SCREENS WITH ANY HDMI INTERFACE
Has a video specifically using a raspi and iphone 4 screen.
It is doubtful that the connections from a cell phone LCD screen would be optimal to use with your Raspberry Pi. That said, I'm positive it's possible.
But, why even go to the trouble? With multiple LCDs made specifically for the Raspberry Pi today (some of them touchscreens!), it is more practical to buy an LCD than to salvage one from a phone and use it. Yes, they can be a bit pricey, but unless you are extremely determined to use this cell phone screen of yours, I would recommend to use one of those dedicated Raspberry Pi screens instead. If you aren't determined enough to reuse this cell phone screen of yours, you are going to get very frustrated.
I found this helpful, android-raspberry-pi-display-over-usb
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