Hey there @TP,
Welcome to the Community and thanks for your post.
Since Mazatlán is a resort town, you shouldn't have any issues using your services there, however services are not always guarantied while roaming.
In some cases depending on your device model, the automatic network selection may need to be switched to a manual selection and tested until your device connects to a functional local network. You can find your device user manual here.
We also invite you to navigate on our website here to review our travel options.
