Why Can't My iPhone Send SMS Messages by Default: Understanding iMessage and SMS

Many users find themselves frustrated when their iPhone doesn't send SMS messages by default to other Apple devices like iPhones, iPads, or Macs. This is due to how iMessage works and the settings you might have overlooked. In this article, we'll explore why iPhone can't send SMS messages by default and how to troubleshoot this issue.

Understanding iMessage and SMS

iPhone is capable of sending both SMS messages and iMessages, but the default setting is to use iMessage unless explicitly turned off. iMessage is a tool that uses cellular data, Wi-Fi, or other internet connections to send messages between devices on your Apple ID account. SMS (Short Message Service), on the other hand, relies on carrier networks to send and receive messages, and it is the traditional method used before iMessage was introduced.

Why iMessage Precedence

Apple introduced iMessage to eliminate the costs associated with SMS messages. Phone companies charged per message and often included a limited number of text messages with each monthly service. Users were incurring bills in the thousands for text message usage. Apple's solution was to offer a free service with no character limits and no additional charges for sending and receiving messages.

Troubleshooting SMS Sending Issues

Here are several reasons why your iPhone might be sending SMS messages instead of iMessages and how to fix it:

1. iMessage Service is Inactive or Disabled

Ensure that iMessage service is turned on and active on your device. If it is not active, you can enable it by checking the settings:

Go to Settings > Messages. Verify that the iMessage switch is enabled. Make sure you have an active internet connection, as iMessage requires a data or Wi-Fi connection to function.

If iMessage is disabled, turn it on to allow your iPhone to send iMessages instead of SMS.

2. Message Center Number Issues

Check if your message center number is set correctly. A message center number is required for iMessage to function. If it is incorrect or accidentally changed, messages might be sent as SMS:

Go to Settings > Messages. Tap Message Centre. Ensure that the correct message center number is selected. Your carrier's number should be 00.

3. Checking iOS Settings for SMS

In rare instances, users might have explicitly disabled the default Messaging app:

Go to Settings > General > Reuse Previous App Suggestion. Make sure the Messaging app is set to Always or When Possible to ensure it is the default messaging app.

Conclusion

Understanding the difference between iMessage and SMS is crucial for troubleshooting issues with your iPhone messaging. By ensuring iMessage is active, checking your message center number, and verifying iOS settings, you can resolve issues and ensure your iPhone sends SMS messages correctly when needed.