Calling 888 numbers using iphone 13

Thanks for reaching out to the Apple Support Communities, Marciacamarilloca,

The ability to make and receive phone calls relies on your wireless carrier's network, and your line of service with them. If most outbound calls are working and the issue is isolated to a particular type of number, this indicates your phone itself is working as it should and the issue is likely to be something on the carrier's end.

To find out why you are unable to call 888 numbers specifically, we would recommend reaching out to your wireless carrier. They will be able to verify your account settings and details, and confirm whether their service supports these types of calls: Wireless carrier support and features for iPhone in the United States and Canada - Apple Support. If you're not in the US or Canada, you can still use this link to help contact your carrier--just select your region from the list at the top of the article.

Have a great day!