Thanks for visiting the Community Forums. I'm sorry to hear you're experiencing service issues on your Samsung Galaxy S8. I completely understand how important it is to have working service. It's my pleasure to help.
We have a wonderful resource you can utilize to work on this problem. It is our Troubleshoot & Resolve Tool. Begin by logging into your account for more personalized troubleshooting. Then, make sure your specific device is chosen and go under Service/network issues. From here, please select the issue you're experiencing and follow the given instruction.
I hope this helps! Have a wonderful rest of the day.
Jess, AT&T Community Specialist
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*I am an AT&T employee and the postings on this site are my own and don't necessarily represent AT&T's position, strategies or opinions.