No service network problem
No service network problem this iPhone5s
iPhone 5s, iOS 12
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Hi! First of all, check if your SIM provider/carrier is experiencing any outages. You can usually find this information on their website.
If that's not the issue, I recommend reading this article for its troubleshooting tips: If you see No Service, Searching, or SOS on your iPhone or iPad - Apple Support. It has some important information regarding iPhone 5s, which you may want to read about.
I hope this helps!