iPhone 11 some calls drop a sometimes my voice sounds like a robot

Contact AT&T. A robotic voice can be an issue with the cellular connection and call drops can be due to tower issues. It can be on either end as well since you are both on cellular at the time. It could be a temporary issue with a tower in one of your areas as well. But it may be something both of you could check with AT&T.

Not for calls. You can ask them for a replacement SIM. But again, it could be you or your daughter's end. She would need to check at her end as well. The robotic sound would be temporary. An occasional connection will do that, again that is on the cellular end of things.

If you get another SIM and there is no issue with your daughter's end, then you can try something. Create a current backup of the iPhone and restore it to factory and set it up as a new phone. Test it at that point. If it works fine, then restore your backup and test it.

Are you dropping that many calls?

Sounds good. Good luck. Between the network reset and a new SIM, that should help. However, you or your daughter may also need to troubleshoot your daughter's phone as well after doing this to yours. I don't want you to assume the only problem could be with your device.

just curious if that has helped? I’ve been having same issues on our lines.