Where out of US does AT&T have service

ATT covers every US state and Puerto Rico.   Some plans also cover Mexico.

Your answer is no, no coverage in Bermuda.

As well as U.S. Virgin Islands and Guam. All the US as well as the territories and commonwealth.

You will have service in Bermuda, but it will be very expensive international roaming.

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@jewelia wrote:
I am going to Bermuda. Can I get service on my cellphone?

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You have some options...

• If your phone is unlocked purchase a local SIM for use while in Bermuda.

• Pay for an International Roaming Passport Plan for use while in Bermuda.

• Use Pay-per-Use Rates while in Bermuda.

• Shut off your phone and not use it while in country.

https://www.att.com/shop/wireless/international/roaming.html

Other free options are (if you have Wifi):

Google voice

Whatsapp

WeChat

Just to name a few.