Replace the Wifi Diversity Antenna: Reemplazo de la antena de diversidad Wi-Fi del iPhone 6s

The iFixit store sells displays for the “Samsung Galaxy S8+” here: Galaxy S8+ Screen

there are two types of networks, CDMA and GSM. CDMA SIM cards are not compatible with GSM phones, and vice-versa. Also, if you have not unlocked your phone from it's carrier and are trying to use a SIM card from another carrier, it will not work. You may also have a damaged SIM card.

Try taking out SIM card from slot on right side of the phone(check the SIM card for crud that might be interfering with the SIM card contacts. Clean it with a DRY toothbrush.) , putting the phone in airplane mode, and putting the SIM card back in. Then turn airplane mode off. If that does not work, take out the SIM card again, and restart the phone, and put the SIM card back in. If that does not work, force restart your phone by holding the power and home buttons at the same time until the Phone restarts. Do this last step with the SIM card in. Only by last resort should you replace the antenna. Hope I could help. -a novice

one thing that may cause your iPhone to reject your charging cable is that your charging socket/hole/connector may be full of dirt, like lint, or dust. a good way to clean this out is with a toothpick, carefully. alternate scraping the dirt out and blowing in the charger port to loosen the dirt. dirt in the charger hole may cause a poor connection, including the error message

Have you tried the speakers with multiple devices? If not, it may be that your audio jack is at fault.

the wall outlet I had it plugged into was rotting apart.

Dose it type words? or just gibberish? if it is typing words, then someone hacked it, and it has nothing to do with being stepped on.

You would get more answers if you asked "How do I fix the broken screen on my kindle touch?" instead of "How to fix the screen". Kindle Touch Screen Replacement

Probable, you have a dead battery. Your device is no longer recharge-able. you will have to replace it to fix it. But I don't know how.