Help me
iPhone 5s, iOS 12
"If your iPhone can't be activated or an alert says the activation server is unavailable [or cannot be reached] or the SIM card is unsupported," read this support article to learn what to do. "If you can't activate your iPhone [or iPad]" - click here --> https://support.apple.com/HT201407
- Note the special link at the end of the document for contacting Apple if there are still problems.