Guides I've Contributed To
Answer to: Why am I getting the “No SIM card detected” error message?If your Samsung Galaxy Tab 4 is not detecting its SIM card, you will not have access to its associated mobile network. This may be the result of faulty software, hardware, or even a faulty SIM card. Usually, the problem is due to debris in the SIM card port, or wear and tear on the SIM card itself. To diagnose the problem, take a look at the Samsung Galaxy Tab 4 7.0 Sprint Troubleshooting guide.
Answer to: Why is the touch screen not responding?If freeing up resources and re-initiating your tablet didn't solve its touch issues, then you might need to open it up to take a look inside. It may be that the connection between the screen and the tablet's motherboard is a bit loose and simply needs to be re-seated. If these symptoms began after a drop, or after the tablet was exposed to water, you may need to replace the LCD display. You can head on to your tablet's troubleshooting page for more info on this matter.