Often times rebooting an iPhone is sufficient to remedy problems like this. If the cellular connection or service is not the issue, continue on with troubleshooting techniques to fix SMS transmission from iPhones. If any of those service related issues are the problem, you’ll need to either regain a stronger cellular signal with the iPhone, or reactivate a cellular service plan if applicable, or insure the proper contact is being messaged. It’s pretty obvious when a text message doesn’t send (or iMessage too), you’ll see a little red (!) bang exclamation sign next to the message, usually with a ‘not delivered’ message.
AirPlane mode is enabled, thereby disabling the ability to send messages and text messages – toggling AirPlane mode off will fix this specific issue quickly. The cell number you are reaching is disconnected – this is often the problem if the recipient has recently changed a phone number or you have multiple contact numbers for the same person, so be sure you are addressing the proper phone number. The cellular reception is so bad that iPhone can’t send a text message – if service is awful (think 1 bar or 1 dot or cycling between “Searching…” and dots), the phone likely won’t be able to send or receive text messages. The iPhone has no service – if the iPhone does not have a cellular service plan active, it will not be able to send text messages. 
The iPhone has no cellular signal – no SMS text messages can be sent without a traditional cell signal. Cell Service Issues Can Prevent Sending Text Messages from iPhoneīefore proceeding with troubleshooting, let’s cover the most obvious service related reasons why an iPhone won’t send a text message: Let’s review those possible reasons and then cover some troubleshooting steps. There are several reasons why an iPhone may not be sending SMS text messages, often it’s service related. Why is my iPhone not sending text messages? Here’s why, and the fix Nonetheless, these troubleshooting tips may resolve an iMessage problem as well. 
We’re not really focusing on iMessage here though, we’re focusing on the standard text message protocol instead. Of course, sometimes the iPhone won’t use the iMessage protocol even if the sender is on an iPhone as well, particularly if the recipient is out of service area or has turned off the iMessage service for some other reason.
Keep in mind that most iPhone users communicate with other iPhone users with the iMessage protocol, which is signified by the blue message bubbles (as opposed to the green bubble which signifies SMS / text messaging).
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