Hey there.
Welcome to Three Community.
I'd recommend checking the Service Status page, as this will let you determine if there's an issue in your area, and might be able to confirm when the issue is going to be resolved.
If you're still having issues and the website can't confirm there's an issue, it might be worth trying to reset the network settings from within the Reset menu on your phone. This will clear any configuration issues and set the carrier settings to the correct settings.
Pete.
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