7 ways to troubleshoot if your phone's SIM card isn't working

If you can't make a call or if you see an error message that your phone's SIM card is not working, there are several ways to ...
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What Is An ICCID Number & How Can You Find It On Your Phone?

If you've ever called your carrier's customer service to activate a prepaid SIM card or troubleshoot a malfunctioning Android SIM card or iPhone SIM, then you've likely needed your ICCID number. The ...