We'd love to help with this. Do you have the AT&T Call Protect app on your Galaxy phone? There's a known issue with caller ID when the device also has the app on it. You might be able to restore your caller ID by going into Apps and find AT&T Call Protect. In Settings, you should be able to disable the app. After doing that, press and hold the Power/Lock button, then select Power Off. Select Power Off again to confirm. After, press and hold the Power/Lock button again until the screen lights up.
Let us know if this helps.
James, AT&T Community Specialist
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