Verify Your Plan: Confirm that you have an active plan with available messages to send text messages.
Check Your Phone Settings: Review the following settings on your phone:
Roaming:
Android: Settings > Connections > Mobile networks > Roaming.
iOS: Settings > Cellular > Options > Roaming.
Network Mode: Ensure that you've selected 4G or LTE for optimal connectivity.
Network Selection: Set network selection to automatic mode for seamless operation.
Coverage: Ensure that there is service available within the Mexican Republic.
Other Possible Reasons:
Short Codes: Service for short codes (e.g., TV contest messaging or supermarket card balance inquiry) may not be available.
Multimedia Messages (MMS): Note that only text messages may be supported, not multimedia messages.
National Numbers: Ensure that the message is sent to a national number to avoid sending issues.