Apple’s iMessage service is a nice alternative to regular SMS text messages. It is convenient for sending messages from an iPad or a Mac computer that does not support SMS text messaging. When an iMessage is sent to someone with multiple devices, the message is delivered to all devices. However, because iMessage can use cellular data when not connected to Wi-Fi, some folks may opt not to use it on the iPhone.
An iMessage is sent using either Wi-Fi or cellular data. When a Wi-Fi network is available, the iMessage is sent over the Wi-Fi connection. When a Wi-Fi network is not available, the iMessage is sent using cellular data. If you regularly approach the monthly limit of your data plan, you may try turning off iMessage to save some cellular data usage.
If you open the Settings app on your iPhone, select Messages, and set the iMessage slider to the off position, you will no longer send or receive iMessages on the iPhone. However, depending on your situation, you may end up not receiving text messages from iPhone users. Additionally, if you have multiple Apple devices, the iMessages will still be delivered to your other devices. This is usually not desirable. Most people want their messages delivered to their iPhone.
To understand what is happening, let’s take a closer look at iMessage. When you initially setup an Apple device, your Apple ID is automatically signed in to the Messages app. When your device is an iPhone, your phone number becomes associated with your Apple ID for use with the iMessage service.
When someone with an iPhone sends a message to your phone number, their Messages app communicates with Apple’s servers and finds your phone number. The sender’s Messages app will then send the message as an iMessage. When someone with an iPhone sends a message to someone without an iPhone, the Messages app does not find the phone number in Apple’s servers and the message is sent as an SMS text message.
Turning Off iMessage
Turning off the iMessage slider on your iPhone will stop iMessages from being delivered to your iPhone. However, it does not stop iMessages from being sent to your Apple ID. Consider the situation where someone has both an iPhone and an iPad. Turning off the iMessage slider on one device will still allow iMessages to be received on the other device.
Even with the iMessage slider turned off, your phone number is still associated with your Apple ID. Therefore, when other iPhone users send a message to you, it is sent as an iMessage. But, since the slider is turned off, the message is not delivered to your iPhone.
Receive All Messages as SMS Text Messages
If you want to turn off iMessage and have all messages delivered to your iPhone as SMS text messages, you need to break the association between your phone number and your Apple ID. Simply turning off iMessage does not break the association.
To disassociate your phone number from your Apple ID, first make sure iMessage is turned off on your iPhone. Do this by opening the Settings app, selecting Messages, and set the iMessage slider to the off position (no green is visible on the slider).
Next, go to Apple’s website and change your Apple ID password. By changing your password, you effectively deauthorize your iPhone from using Apple’s services until it can re-authenticate with the correct password. With the iMessage service deauthorized to your iPhone, Apple’s servers will no longer associate your phone number to your Apple ID.
After changing your password, you will need to sign back in to services like the iTunes & App Store and iCloud.
Do not sign in to Settings -> Messages and do not turn on the iMessage slider on your iPhone. Doing so would re-associate your phone number with your Apple ID.
Now, when someone with an iPhone sends a message to your phone number, the Messages app will not find your number in Apple’s servers and the message will be sent as an SMS text message through your cellular provider. Regular texting rates will apply.
by T Mitch