How to fix MMS that won’t send on your HTC U12/U12 Plus smartphone [Troubleshooting Guide]

When your phone suddenly failed to send MMS messages, it may be having some network connectivity issues or something have caused the MMS function to fail. In most cases, the main problem is attributed to software errors on the phone. This makes it possible for end-users to resolve at home. To give you some inputs on how to deal with this issue on your HTC U12/U12 Plus smartphone, I’ve mapped out a few generic solutions for you to try on. Keep scrolling and read on for more helpful solutions.

Before going further, if you found this post because you were trying to find a solution to your problem, then try to visit our troubleshooting page as we’ve already addressed most of the commonly reported issues with the phone. We’ve already provided solutions to some of the problems reported by our readers so try to find issues that are similar with yours and use the solutions we suggested. If they don’t work for you and if you need further assistance, fill up our Android issues questionnaire and hit submit.

How to troubleshoot HTC U12 that won’t send MMS

Prior to troubleshooting, it’s important to double-check and ensure that MMS is properly set up on your device. While MMS may be setup automatically with your SIM or network, it’s can be turned off on purpose or accidentally. If necessary, set up MMS manually on your phone. Also ensure that your phone is connected to the Internet either through Wi-Fi or cellular data. If your relying on Wi-Fi Internet for MMS services, a stable Wi-Fi connection on the phone is needed. Otherwise, enable Cellular data or Mobile data to use MMS services based on your account credits. Make sure you have the terms clarified with your service provider/carrier to avoid incurring extra charges. If everything is good with the network and account requirements and yet your HTC phone still won’t send MMS messages, troubleshoot software problems on your phone with these subsequent methods.

First solution: Reboot your phone (soft reset).

Minor software errors may have affected network functions of your phone, particularly MMS sending. As first possible solution, you can try carrying out a soft reset or simply reboot your phone with these steps:

Press and hold the Power button for a few seconds or until the menu options appear.
Then tap Restart.
Alternatively, you can force your phone to restart if it’s frozen by pressing and holding the Power button for at least 10 seconds and then release the button when the HTC logo appears.

A soft reset effectively clears random glitches that cause minor errors on the phone. This doesn’t result to data loss, hence no need to back up files.

Second solution: Update phone software to the latest version available.

Software bugs and invalid settings on the phone can also cause similar issues to occur. As resolution, check and install the latest software version on your phone. Updates usually contain bug fixes to clear issues inflicted by software bugs and malware. To check for OTA updates manually, follow these steps:

Slide the Notifications panel open.
Then tap the system update notification.
If necessary, tap Update over Wi-Fi only if you don’t want to download the update using data connection.
Then tap Download to continue.
Wait until the download is finished then select the option to Install now.
Tap OK to confirm.

Your phone must have a strong and stable Internet connection to proceed with the update download and installation.

Third solution: Reset APN settings/network settings on your phone.

Network errors can also prevent your device from connecting to mobile data or Wi-Fi. If that happens, you won’t be able to use network-related features including MMS on your phone. To clear this out, try to reset network settings or APN settings on your HTC U12/U12 Plus with these steps:

Swipe up from the Home screen then tap Settings.
Tap System.
Then tap Reset.
Scroll to and tap Network settings reset from the given options.
Then tap Reset settings twice to confirm.

Your phone should restart by itself when the network settings reset is finished. You will need to reconnect to Wi-Fi or Mobile data afterwards to use MMS again.

Fourth solution: Wipe cache partition.

Wiping cache partition means clearing cache from the system folders of your device. Like app caches, system cache can also cause other features to fail when then become corrupted. To make sure these aren’t the preventing you from sending MMS messages, follow these steps to wipe cache partition on your HTC U12/U12 Plus smartphone:

Power the phone off completely.
With the phone powered off, press and hold the Volume Down button while turning the phone on.
Continue to hold the Volume Down button until the bootloader screen is displayed.
Press the Volume Down button until Recovery is selected.
Press the Power button to confirm selection. The phone will then seem to reboot and the screen will turn black for 15 to 30 seconds.
Wait until the recovery screen is displayed then continue with the next steps.
Hold the Volume Up button and then press and release the Power button.
Press the Volume Down button repeatedly until Wipe Cache Partition option is highlighted.
Then press the Power button to confirm selection.
Press the Volume Up button repeatedly after the process completes.
Press the Power button to select Reboot system option.

Retry sending and receiving MMS on your device after the phone reboots and see if it’s already working as intended. Otherwise, you may have to resort to a full system reset.

Fifth solution: Restore your phone to factory defaults (master reset).

This can be considered as the last option if all else failed to solve the problem. You’re likely dealing with a complicated system error, which requires a full reset. Please note though that this reset will delete saved data on the phone, so if make sure you back up all critical information you saved in your device beforehand. Once you’re all set, follow these steps to reset your HTC U12/U12 Plus to its factory defaults:

Swipe up from the Home screen.
Tap Settings.
Tap System then Reset.
Select Factory data reset option.
Make sure you don’t select the option to Erase SD card if you don’t want to delete media and other data from your SD card. Otherwise, mark the option to clear the SD card contents as well.
Tap Reset Phone.
Then tap Erase Everything to confirm.

Your device will then instigate the system reset and then automatically reboots when done. Wait until it has completely restarted and then set it up as new. Don’t forget to enable Wi-Fi or Mobile data to activate network services including MMS and use them again on your phone.

Other options

You may escalate the problem to your carrier or HTC Support for further recommendations and more advanced troubleshooting procedures. There may be some advanced settings that need to be re-configured on your phone. Also ensure that MMS services are provisioned or included in your current plan or subscription. Talk to your service provider/carrier for more information. If it occurs among other post-update issues, then report it to HTC so they can do further assessments and if necessary, create a fix patch to solve it.

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