2. Third-Party Apps:

Third-party apps are available on the Google Play Store that can help you turn your Android phone into a WiFi repeater. Apps like "NetShare - no-root tethering" or "WiFi Repeater" provide easy-to-use solutions.

What to Do When Your iPhone Says 'No SIM'

What to Do When Your iPhone Says 'No SIM'

Remove the iPhone SIM card and reset it

Since the No SIM problem is commonly caused by a dislodged SIM, try reseating it. After a few seconds (up to a minute), the No SIM Card Installed error should disappear and your bars and carrier name should reappear.

Restart iPhone

If your iPhone still doesn't recognize the SIM, try the all-purpose fix for many iPhone problems: a restart. You'd be surprised how many issues are solved by restarting.

Turn Airplane Mode On and Off

If you're still seeing the SIM error, your next step is to turn Airplane Mode on and then off again. Doing this can reset the iPhone's connection to cellular networks and may resolve the problem.

Make sure your phone account is valid

Your phone account may be invalid. You need an active phone company account to connect your phone to a network. SIM error appears if your account is suspended, cancelled, or has another problem.

Contact Apple tech support.

If all of these steps don't solve the problem, you have a problem that you can't fix. You can make an Apple Store appointment online.