My Samsung Galaxy Tab S cant connect to Wi-Fi, keep asking for SIM Card. I have been connecting via Wi-Fi all this while, without the SIM Card. Recently it kept asking for SIM Card. I have done Factory Reset but to no avail.
If the device is actually trying ot access data rather than WiFi, it will do that. Make sure that the 'Data" option is turned off in the devices "Settings" and then restart it.
If that doesn't work, I would start looking at what apps you have recently installed or updated. It may be them that is is the cause. Try uninstalling new ones or removing updates recently done and then restart again.
If those don't work, then try the following options...
1. Try and restart the tablet. Sometimes it is that simple.
2. Update the firmware and any apps that need updating on the tablet.
3. If the problem persists, check your time and date on the tablet to make sure it is correct.
4. Should none of the former work...
a. Clear out the WiFi data on the tablet.
b. Reboot the modem/router.
c. Once the modem/router is fully 'up' again, reboot the tablet and re-input the WiFi data.
5. Check your internet connection. It may be what is going in and out rather than the tablet.
6. Make sure you have "Data" turned off on the device when using "WiFi" (that is if you have a plan with data through your tablet). If youdn't make sure it is turned off, the device can keep trying to switch to "Data" when you try and use "WiFi".
7. Now, if you are still having the problem at this point, and you are sure it isn't the modem/router that is the problem. Then you may wish to try a "Hard Reset" of the device. However, I really suggest saving this as a last option (or last before parts repair/replacement).
NOTE: Doing this will clear 'all' the data on your tablet, so it is suggested you not choose this option unless you have to, or aren't worried about losing anything on the device.
Be sure you back up any data you want to keep, to a computer or cloud account, before doing the reset.
To "Hard Reset" the tablet...
1. Make sure that the tablet is actually powered off.
2. Press the "Power" and the "Volume Up" buttons, together, until you see the start-up logo on the screen.
3. Once you can see the logo, release the buttons and allow the device to enter the "System Recovery Mode".
4. Next use "Volume Down" button to get to the "wipe data/factory reset" option When in recovery mode the "Volume Up" and "Volume Down" buttons are how to can navigate and highlight what option you need.
5. Once you have selected the "wipe data/factory reset", press the "Power" button to select that option.
6. On the following screen, repeatedly press the "Volume Down" button until the "Yes - delete all user data" option is what is selected.
7. Then press the "Power" button to hard reset the tablet.