Why is my stuck on sos

SOS indicates that your phone does NOT “see” your carrier … but that it does “see” another carrier.

Assuming that you ARE within your carrier’s coverage footprint, see the following:

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

Hello Kenb91!

If you’ve tried all the suggestions in the Related Article above your name, then please reach out to your carrier for further assistance.

If your carrier determines that there is no issue on their end, you’ll want to contact Apple Support:

• Telephone: Contact Apple for support and service - Apple Support. 
• Online #1: Start your request online. 
• Online #2: Support
• Live Chat: Live Chat with an Apple Advisor in Messages. 
• More Contact Info: Contact - How to Contact Us - Apple. 

Have a nice day, and good luck!