Clear Cache Files on your Android Device On some phones, you will find the option to clear the cache in the Settings app. However, if you do not have this option, you can use the clear cache option in recovery mode which should be available on most phones out there.
Why is my phone saying no SIM?
The SIM isnt inserted properly. Remove the SIM and reinstall it. Sometimes, the SIM is loose or not pushed in all the way which can trigger an error code. All you need to do is eject the SIM card tray, which is on the side of the phone, and take the SIM out.
Can you use Samsung phone without SIM?
The short answer, yes.Your Android smartphone will totally work without a SIM card. In fact, you can do almost everything you can do with it right now, without paying a carrier anything or using a SIM card. All you need is Wi-Fi (internet access), a few different apps, and a device to use.