It’s most likely due to the battery acid expanding cause the batter to be bloated and the adhesive to break loose so what Id do is buy a battery and adhesive and fix it. So yea it is fixable. You can also visit repairing guides on ifixit.com.
Well I had a similar problem with my iphone X and I fix it with out replacing anything. What you want to do is go to the settings and general and rest then reset your network settings. If that doesn’t work go on a computer install the newest verion so it can replace and repair the IOS. Create a backup and reinstall the base OS and the put the backup back on it.
The sews from your “iPhone 6s” should work with all phone above the iPhone 3. I recently got a iPhone X and I can tell you the the sews are the same size and length as the iPhone 6 and 6s.
Most cars and trucks have either hard bumpers like a 1956 custom line has a very hard bumper so if a modern car were it hit it with their door it would not do much but leave a little paint on the bumper. The door is more likely to be damaged. Provided the model it many be different.
I understand that this may be very frustrating so I’ll try my best to help you. This situation is very weird. The drop may have somehow damaged the logic board if it did you’d have to buy a new iPhone Xr because this part is very hard to repair has it is the motherboard of a phone. I can see two more solutions one is to take caned air and air down the internals. The next solution is to attempt to repair the rear camara. Hope that this helps you. -Noah Byrum
If you take the iPhone apart again ,and try taking out the battery for a few minutes. After a few minutes is over put the battery back in if it continues to not work try replacing your LCD, digitizer and or the whole display. 如果再次拆开iPhone,请尝试取出电池几分钟。几分钟结束后,如果电池继续不工作,请将电池放回原位,尝试更换LCD,数字转换器和/或整个显示器。 Si vuelve a desmontar el iPhone, intente quitar la batería durante unos minutos. Después de unos minutos, si la batería sigue sin funcionar, vuelva a colocarla en su lugar e intente reemplazar la pantalla LCD, el digitalizador y / o toda la pantalla.