Did you know that using iMessage to send texts, pictures and videos to other Apple devices uses your data? If you’re not connected to Wi-Fi and don’t have a data plan, sending iMessages to other Apple devices means you will incur pay-per-use data charges.
To avoid extra data charges, you can enable the “Send as SMS” feature, which allows you to send iMessages as an SMS when data is unavailable.
Turn on this feature by following these steps:
Send as SMS
toggle to ON
Or, you can simply add a data plan and do more of what you love, without having to worry about overage charges. From