"How can I get my power button unstuck?"に関する回答The power button can be accessed by removing the back of the phone. From there it can be pulled out and replaced. Check out the Troubleshooting Guide.
"If my microphone does not pick up sound, how do I fix it?"に関する回答The microphone can be accessed from the motherboard. From there, you can replace it. Check out the Troubleshooting Guide for more help.
"Can I replace the SIM card?"に関する回答Using a paperclip, insert the end of the paperclip into the hole at the top of the phone to press the SIM card down. The SIM card and SIM card tray should pop out after you press it. From there, you can insert a new SIM card. Check out the Troubleshooting Guide for more help.