
If no Internet connection is available, the Messages app may attempt to deliver the iMessage as a regular SMS text message. This Internet connection can be either Wi-Fi or your cellular provider’s data network. When you send an iMessage, Apple will route that message through their servers using an Internet connection. The Messages app on the iPhone is capable of sending and receiving regular SMS/MMS text messages as well as iMessages.
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This article will address a common question regarding why an iMessage will sometimes be sent as a regular SMS text message. I published an article describing the difference between a text message and an iMessage, which has been quite popular and generated some additional questions related to iMessage.
