Can’t send iMessage in mexico

Hi d_in_metrowest,

For help with activating iMessage while roaming, check the settings with the steps below found in the article here: If you can’t turn on or sign in to iMessage or FaceTime

"Check your device settings

1. Make sure that you’re connected to a cellular data or Wi-Fi network. 
2. If you're using an iPhone, you need SMS messaging to activate your phone number with iMessage and FaceTime. Depending on your carrier, you might be charged for this SMS.
3. Go to Settings > General > Date & Time and make sure that your time zone is set correctly."

If the issue continues, follow the remaining steps in the article. You can also find helpful information in the section "If you have roaming issues during international travel" here: About cellular data roaming options for your iPhone and iPad

Cheers.

Good afternoon d_in_metrowest,

Let us know how it goes. Enjoy the rest of your day!