The modern Android smartphone has become the center of our digital life, but classic text messages and multimedia mailings remain the most important communication channel in situations where there is no access to the Internet or instant messengers. Incorrect configuration of network settings often leads to important notifications from banks not being received, and attempts to send a photo to a contact person ending in an error. Understanding how messaging protocol works in the system allows you to avoid unnecessary calls to the operator's support service.
In this article we will analyze in detail the process of setting up standard and advanced data transfer functions. You don't need to be a technician to fix the situation. Just carefully follow the steps described below and check the key parameters of your device.
Selecting and setting up a messaging application
The first step towards stable communication is choosing the right software. In modern versions of the operating system, Google promotes its solution Google Messages, which supports the advanced RCS standard. However, many smartphone manufacturers, such as Samsung or Xiaomi, preinstall their own shells.
You need to make sure that the selected application has all the necessary permissions to work with the network and contacts. Without this, Android security may block data transfer in the background. Go to your phone settings, find the “Applications” section and select your messenger.
In the permissions menu, check the checkboxes next to the “Phone”, “Contacts” and “SMS” items. If you are using a third-party client, such as Textra or QKSMS, make sure it is set as the default app. This is critically important, as the system may try to use hidden or deactivated services to send.
- 📱 Open the device settings and go to the "Applications" section.
- 🔍 Find your messaging application in the list (for example, "Messages" or "Messaging").
- ⚙️ Click “Default application” and select the desired option from the list.
- 🛡️ Check your permissions and make sure that SMS permission is active.
⚠️ Attention: If you have multiple messaging apps installed, the system may ask you which one to use each time. This may lead to delays in sending emergency notifications.
Configuration of APN access points for MMS
The most common reason for the inability to send or receive multimedia messages is incorrect configuration of Internet access points, known as APN (Access Point Name). Unlike regular SMS text messages, which use a cellular network signal, MMS requires an active mobile data connection.
Usually the settings are loaded automatically when you install a SIM card via OTA settings. However, if you changed your tariff, moved to a different region, or are using an old SIM card, your data may be out of date. You will need to enter them manually using information from the official website of your telecom operator.
To access these settings, you must go to the mobile networks menu. The path may differ depending on the phone model, but usually it looks like this: Settings → Connections → Mobile networks → Access points (APN). Here you will see a list of available profiles.
| Operator | Point name (Name) | APN (Access Point) | Authentication type |
|---|---|---|---|
| MTS | MTS Internet | internet.mts.ru | PAP or CHAP |
| Beeline | Beeline Internet | internet.beeline.ru | No or PAP |
| Megafon | Megafon Internet | internet | No |
| Tele2 | Tele2 Internet | internet.tele2.ru | No |
When creating a new access point, make sure that the "APN Type" field contains a value mms or default,supl,mms. An error in one letter can lead to the Internet not working, but pictures will not be sent. After entering all the data, be sure to save the profile and select it by clicking on the circle next to the name.
If MMS are not sent after entering the settings, try rebooting the device in airplane mode for 10 seconds and then turning it off. This will forcibly re-register the phone on the network with new parameters.
Activation of the enhanced messaging function (RCS)
Technology RCS (Rich Communication Services) is an evolution of classic SMS. It allows you to send high-quality messages, see delivery and printing status, and transfer large files without converting to MMS. This feature works over the Internet, but is integrated into the standard messages application.
To take advantage of RCS, you will need to sign in to your Google account within the app. Go to the Messages application settings, select “Chat” or “Chat options”. If the status appears as "Connecting" or "Setting", wait a few minutes.
Sometimes the function does not activate due to problems with the operator's server or firmware incompatibility. In this case, you can try clearing the Google Play Services application cache. Go to Settings → Applications → Google Play Services → Storage → Clear cache. This action is safe and will not delete your personal data.
- 💬 Open the Messages application and click on the profile icon.
- 🌐 Go to “Message settings” → “Chat functions”.
- ✅ Make sure that the “Enable chat functions” switch is active.
- 📶 Check the connection status: it should be “Connected”.
What to do if RCS is constantly disconnected?
If the status constantly resets to “Disabled”, try deleting and re-adding your Google account in your phone settings. Also make sure you don't have power saving mode enabled, which could block background chat syncing.
Solving sending and receiving issues
Even with the correct settings, users may experience intermittent crashes. Often the problem isn't with the phone, but with a full message store or a temporary glitch on the cell tower side. If messages do not go away, first check the availability of free space in the internal memory of the device.
Another reason may be that the number is blocked or the Do Not Disturb mode is accidentally activated. Check the list of blocked contacts in the application settings. Also make sure that your account balance is positive, as some operators block outgoing traffic with a zero balance, even if the package of minutes has not been exhausted.
⚠️ Attention: Do not try to send MMS if your mobile data is completely disabled. Even if Wi-Fi is active, some older configurations require a mobile connection to download media.
In situations where nothing helps, an effective method is to reset the network settings. This action will return all Wi-Fi, Bluetooth and mobile network settings to factory defaults. Your personal files, photos and contacts will not be affected, but you will have to re-enter passwords for saved Wi-Fi networks.
☑️ Diagnosing problems with SMS
Setting up features for two SIM cards
Owners of smartphones with support for two SIM cards often encounter confusion when sending messages. The system must clearly understand which card to send the message from, especially if the tariffs for them are different. In modern Android interfaces, card selection occurs directly in the message typing window.
However, if the selection does not occur automatically, you need to configure the priority in the general settings. Go to section Settings → SIM cards. Here you can set the default map for voice calls and data. For MMS, it is critical that the card from which the sending is made has an active mobile data.
If you use one card only for calls, and the second for the Internet, make sure that in the APN settings the profile of the card through which Internet traffic is sent is selected. An error in selecting an access point for an inactive SIM card will result in an endless attempt to send and eventual failure.
When using two SIM cards, always check which one is selected for the mobile data, since MMS cannot be sent through the card without an active connection to the data network.
Frequently asked questions (FAQ)
Why are MMS not sent even though the Internet is working?
Most often the problem is the wrong APN access point type. Make sure that the “Type” field in the access point settings contains the value mms or default,mms. Also check if the background data transfer limit is set for the messages application.
How to transfer old SMS to a new phone?
To do this, it is best to use the Google Drive application for backup or specialized utilities like SMS Backup & Restore. In the Messages application settings, find the “Backup” item and enable synchronization with your Google account.
Can I send MMS via Wi-Fi?
Yes, if you have the VoWiFi function configured (Wi-Fi calls) and support data transfer via Wi-Fi for the operator's official needs. However, the classic MMS technology is historically tied to the mobile data channel, so in most cases an active mobile data is required.
What does the “Not Delivered” error in SMS mean?
This error may mean that the recipient’s number is incorrect, the subscriber’s phone is turned off or is out of network coverage for a long time. Also, the problem may be on the side of your operator if the message limit in the package has been exhausted or there are technical problems.
How to disable the conversion of long SMS into MMS?
In some applications, this option is located in the advanced message settings. Look for the “Input Mode” or “Message Limit” item. However, it is worth remembering that breaking a long text into several parts may cost more than one MMS, depending on your tariff.