Stuck “Sending” status for photos and videos during instant delivery of text messages indicates a failure in the settings of the APN access point or a conflict of network protocols on the Android device, and not about problems with Internet connection as such.
Unlike regular SMS, which use a cellular signal channel, multimedia messages require an active connection to a data network. That is why, even if there is a strong network signal and working voice communication, sending MMS it can be blocked. Before taking the device to a service center or resetting the settings to factory settings, it is worth conducting a deep diagnosis of the software parameters and operator settings.
In this article we will analyze in detail all possible causes of failures: from outdated APN settings to conflicts with new OS versions and antiviruses. You will learn how to check the limits of your tariff, correctly configure the access point manually, and what hidden settings can block the transfer of “heavy” files. Understanding the mechanism of operation of the MMS gateway will help you quickly return messaging functionality to normal mode.
Main reasons for blocking multimedia sending
The first thing you need to check is the state of your mobile data. MMS cannot be sent without an active GPRS/3G/4G/LTE connection. It often happens that the data package is exhausted, or the operator has temporarily suspended the data service due to a negative balance, even if voice communication remains available. Check the status of the SIM card in your personal account or via USSD request.
The second common reason is the file size. Telecom operators set strict limits on the size of one message. If you are trying to send a raw photo at maximum resolution or a long video, the system will simply reject the request. In such cases mobile operator automatically compresses the content, but sometimes this process fails and the message gets stuck in the queue.
- 📶 Lack or instability of mobile data (check the 4G/LTE/H+ icon).
- 💰 Negative balance or exhaustion of the traffic limit on the tariff.
- 📏 Exceeding the permissible attachment size (usually the limit is 300–500 KB).
- ⚙️ Incorrect APN access point settings after changing the operator or resetting the settings.
It is also worth considering regional features. When roaming, sending MMS is often blocked by default or requires separate activation of the service. If you are abroad or in the coverage area of another operator within the country, make sure that the service Data Roaming (Data Roaming) is enabled in your smartphone settings.
Checking APN access point settings
The most technically difficult, but the most likely cause of problems is incorrect access point (APN) parameters. It is through this gateway that the phone connects to the operator’s server to transfer multimedia. If an incorrect MMSC address or protocol type is specified in the settings, the phone will physically not be able to “reach” the sending server.
To correct the situation, you need to go to the network settings. The path may vary depending on the shell, but usually it looks like this: Settings → Connections → Mobile networks → Access points (APN). Here you will see a list of profiles. If the list is empty or the settings look strange (for example, after a software update), they need to be created or edited manually.
Pay special attention to the fields MMSC and MMS proxy. These parameters are unique for each operator (MTS, Beeline, Megafon, Tele2, etc.) and often change when updating tariff plans. An incorrect port or missing prefix http:// in the MMSC address is guaranteed to result in a sending error. The data to fill out can be found on the official website of your operator.
⚠️ Attention: Before making changes to the APN settings, take a screenshot of the current settings or write them down. This will allow you to quickly restore the functionality of the Internet if the new settings turn out to be incorrect.
After entering all the data, be sure to save the profile and select it active (put a dot or a checkmark). Sometimes you need to reboot the device for the changes to take effect and the communication module to reconnect to the network with new routing parameters.
The influence of file size and content format
MMC technology is outdated and is not intended for transferring high-quality files. The standard message size limit varies from 300 KB to 1 MB depending on the operator. Modern smartphone cameras take pictures weighing 5-10 MB, which is tens of times more than the permissible limit.
When you attach a photo to a message, the Android system tries to automatically compress the image. However, compression algorithms may not work correctly, especially if the file has a specific format, for example HEIC (Apple standard) or WEBP, which are not always supported by older MMS gateways of the Big Four operators.
| Operator | Recommended max. size | Supported formats | Compression features |
|---|---|---|---|
| MTS | 500 KB | JPEG, GIF, MP4 | Automatic strong photo compression |
| Beeline | 300 KB | JPEG, 3GP | Video is converted to low quality |
| Megafon | 512 KB | JPEG, PNG, MP4 | Strict check of file headers |
| Tele2 | 1 MB | JPEG, MP4 | Slow processing of large attachments |
If the message does not go away, try sending a smaller file or changing its format to standard JPEG. In the camera settings, you can temporarily change the resolution of the pictures or enable the “Optimize for MMS” option, if such a function is provided by the manufacturer of your smartphone.
Try sending MMS at night (from 02:00 to 06:00). At this time, the load on operator gateways is minimal, and the likelihood of successfully sending “heavy” files increases significantly.
Application conflicts and power saving modes
Modern versions of Android aggressively manage energy consumption, often “killing” background processes that seem unnecessary to the system. A messaging app attempting to send MMS in the background may be stopped by the power saver until the data is uploaded to the server.
Also, third-party SMS/MMS apps may conflict with standard dialing or Google system services. If you've recently installed a new messenger or launcher, check to see if you accidentally set it as your default messaging application.
- 🔋 Energy Saver mode blocks background data transfer for MMS.
- 🛡️ Antiviruses and firewalls can block outgoing traffic to ports MMS.
- 🔄 The Messages application cache is full and contains errors.
- 🚫 Third-party applications take priority over the system sending service.
For diagnostics, try temporarily disabling the power saving mode and sending the message again. It’s also worth going to application settings, finding your messenger and clearing its cache Settings → Applications → Messages → Memory → Clear cache. This will not delete your correspondence, but will reset temporary files that may have been damaged.
⚠️ Attention: Do not use “memory clearing” with third-party cleaning utilities immediately before sending an important MMS. Aggressive cleaning can terminate the data download process, interrupting the sending of the message.
Problems with the SIM card and network coverage
Sometimes the problem lies not in the phone, but in the physical SIM card. Old SIM cards that you have been using for many years may have worn out contacts or may not support modern data transfer protocols necessary for stable operation of MMS in 4G networks.
It is also worth checking whether the SIM card is correctly defined in the settings if you have a smartphone with two slots. In some Android models, sending MMS is only possible from the main SIM card (SIM 1), or you need to manually select a SIM card for data transfer at the time of sending.
Try moving the SIM card to another slot or to another phone. If MMS are sent without problems on another device, then the problem is in the settings of your main smartphone. If the problem persists everywhere, the SIM card is probably damaged or needs to be replaced at the operator's salon.
☑️ SIM card diagnostics
Specific errors on different versions of Android
Different Android shells (MIUI, OneUI, ColorOS) have their own implementation features of the communication stack. For example, on smartphones Xiaomi with the MIUI shell, a bug is often encountered when, after a system update, the access rights of the messaging application to the mobile data are reset.
On devices Samsung with the OneUI shell, the problem may be related to the “Smart Manager” function, which automatically switches the network to Wi-Fi, even if the signal is weak, interrupting the process of sending MMS, which requires a mobile IP address.
Owners of smartphones on “pure” Android (Pixel, Motorola) should check data roaming settings, even if you are not abroad. In some firmware, local switching between towers of different standards is interpreted by the system as roaming, and without a checkmark Data roaming MMS transmission is blocked.
Hidden setting for advanced users
In the engineering menu (code ##4636##) you can check the status of PDP Context. If it is not active, MMS will not be sent. However, changing the settings here is dangerous - you can completely lose connection.
Alternative solutions and switching to instant messengers
If all of the above methods did not help, your operator may be temporarily experiencing technical difficulties with the MMS gateway in your region. In this case, all that remains is to wait for the network to be restored.
It is also worth thinking about the fact that MMC technology is archaic. It's slow, expensive and unreliable. Most users have long switched to instant messengers (Telegram, WhatsApp, Viber), which use the Internet channel and do not have problems with setting up APN or file size limits.
If it is critical for you to send a file through a standard messaging application (for example, the recipient needs the MMS format to automatically upload to the gallery without installing applications), try sending the text separately, and the media file through cloud storage link.
⚠️ Attention: Tariffs for MMS may differ from tariffs for regular SMS and Internet. Check the cost of sending one message with your operator to avoid unexpected charges.
In 90% of cases, the problem is solved by correctly setting up the APN access point or turning on the mobile data. If this does not help, the problem is on the operator’s side or a physical SIM malfunction.
Frequently asked questions (FAQ)
Why are MMS not sent even though the Internet is working?
Internet and MMS use different settings. For the Internet, you need a working APN access point with the correct Internet parameters, and for MMS, the same settings, but with the MMSC and MMS proxy fields required. Check these two parameters in the access point settings.
Is it possible to send MMS over Wi-Fi?
Technically, the MMS standard requires a connection to the operator's mobile network for authentication. However, some modern smartphones and operators support the Wi-Fi Calling function, which allows you to send MMS via Wi-Fi if a mobile network is not available, but this option must be explicitly enabled and supported by the tariff.
What to do if MMS hangs in the "Sending" status?
Do not wait endlessly. Cancel the send, restart your phone, and turn Airplane mode on and off. If that doesn't help, clear the message app cache. Often a freeze means that the file is too large and the connection has timed out.
Does an antivirus affect the sending of MMS?
Yes, some antiviruses with the “Privacy Protection” or “Traffic Control” function can block the message application’s access to the network, considering it suspicious when trying to download data. Try temporarily disabling the antivirus to check.
Why did MMS stop coming after changing the phone?
When transferring a SIM card to a new phone, the access point settings (APN) are often not transferred automatically or are transferred incorrectly. Go to the mobile network settings of the new device and update the APN settings manually or request automatic configuration from the operator.