My phone getting hot

@eliyassegu it would be great if you could give us more information. It would be great to know if anything happened to your phone and when it does heat up. Commonly Heat=shortcircuit. and with cell phones this is most commonly because of a bad battery. Start by replacing that. Re-evaluate after you change it.

Since iFixit does not yet have a guide for this, use something like this video Replacement batteries are readily available and purchase from a reputable vendor in your geographic region

While you work on your phone, take lots of pictures. Once you are done with it, take those pictures and create a guide for iFixit. That will help the next person that has the same problem as you do. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.