iPhone showing SOS and not connecting to the internet

“Internet access issues: iPhone showing SOS not picking up available internet. Resets after I shut down & restart but continues to happen”

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Troubleshooting SOS (and "No Service"):

What may have Happened:

1. Find Out here: If you See No Service, Searching, or SOS on your iPhone or iPad - Apple Support
2. As it reads: "If you see SOS or 'SOS only' in the status bar, your device isn't connected to a network"

So, get connected:

Troubleshooting Cellular Service:

A. "No Service":

Is "No Service" shown on the top-left corner of your screen? If so, go here to fix that: If you See No Service or Searching on your iPhone or iPad - Apple Support

B. No SIM":

Is "No SIM" shown on the top-left corner of your screen? If so, go here to fix that: If you See 'invalid SIM' or 'no SIM' on your iPhone or iPad - Apple Support

C. Contact your Carrier:

Having issues with Cellular, contact your Carrier, asking them to configure this to the correct settings. They configure all of this in the SIM card.

Please review the following article:

If you see SOS, No Service, or Searching on your iPhone or iPad - Apple Support

Though you will most likely need to contact your carrier.