mayflower

maybe the touch screen has been damaged during yout operation or there is a loose connection

Then you can email them and ask about it .

Many of my friends like buying cell phone accessories from GlobalDirectParts. they said the quality is good, maybe you can browse their website to search a sim card tray.

Common issues ,I ofen heard this kind of problems , you should restart it. if still do not work, replace the lcd and screen flex ribbon.

The problem lies in the microphone, just replace a microphone. wish can help you .

Cut off the power supply first. you can use a hair drier to dry it.

you can restart the phone , if it still not fixed, check the battery, or the problem may lies in the LCD or the ribbon, you can consider replacing the LCD and the screen flex cable ribbon.

There are several reasons for that : 1. the temparature of the battery or the motherboard is too high, so do not let it work for a long time. 2. there is a leakage of electricity inside. 3. the battery has an unstable power supply. 4. you have to replace the screen. And there also maybe have software problems .

They are not compatible with each other.