The question of how to track the read status of a standard text message has been worrying smartphone users for decades. In the era of instant messengers, we are accustomed to seeing two checkmarks or the inscription “Read”, but in the world of classic SMS messages the situation is radically different. Many owners of devices based on Android erroneously believe that a hidden setting or third-party application can reveal the secret of whether the recipient has picked up the phone.
The reality is that the protocol GSMon which cellular communications are based did not initially provide feedback from the client about the fact of reading the text. This is a fundamental limitation of the technology, not a flaw in the handset manufacturers. Understanding the difference between delivery to the server and the opening of a message by the user is critical for correctly assessing the situation.
Next we will analyze in detail the technical nuances of the network, existing misconceptions and real ways to control data transfer. You'll learn why even the most advanced apps can't bypass the protocol's limitations and what alternatives exist to ensure you receive a response.
Technical limitations of the SMS protocol and delivery reports
Fundamental misunderstandings of how cellular communications work give rise to myths about the possibility of covert espionage on messages. Standard SMS (Short Message Service) works on the “send and forget” principle. When you press the send button, your phone contacts the nearest tower and transmits the data packet to the operator's switching center.
The system can only confirm one step in the journey: successful delivery of the message to the recipient's device. There is a function for this Delivery report. However, this report only indicates that the recipient's phone received the data packet and stored it in memory. It says absolutely nothing about whether the screen is on, whether the device is unlocked and whether the user has opened the Messages application.
In the settings of most smartphones Samsung, Xiaomi or Pixel this option is activated manually. The path to it usually lies through the menu Settings → Messages → Advanced settings → Delivery reports. Activating this option will change the status of the message from "Sent" to "Delivered", but no further.
⚠️ Attention: The status "Delivered" does not mean that the person saw the text. The phone could be in your pocket, turned off immediately after receiving a signal, or in Do Not Disturb mode when notifications are hidden.
It is technically impossible to implement the “Read” function in classic SMS without installing special software on both devices. The protocol simply does not contain a field to transmit such an event back to the sender. Any promises to the contrary are contrary to the architecture of cellular networks.
Use delivery reports only to confirm that the number is active and within network coverage. This is the only technically valid status in SMS.
Why is there no "Read" function for regular messages in Android
Lack of this function in the operating system Android often causes confusion among users who have migrated from proprietary ecosystems. The fact is that Android is an open platform that runs on top of standard telecommunications protocols. Google developers cannot add a function that is not supported by the infrastructure of telecom operators.
Unlike Internet instant messengers, where the servers of the owner company control the entire transfer process and can record the opening of a chat, SMS passes through the gateways of different operators. There may be several intermediate nodes between the sender operator and the receiver operator. None of them has access to the recipient's phone interface.
There is a technology RCS (Rich Communication Services) that Google is actively implementing into the application Google Messages. It allows you to see read statuses, but only works if strict conditions are met:
- 📱 Both subscribers use smartphones with RCS support.
- 🌐 Both have mobile data or Wi-Fi enabled.
- ⚙️ The chat function is activated in the application settings of the sender and recipient.
- 📶 Both subscribers are in the network of an operator that supports this standard.
If at least one condition is not met, the message is automatically sent as normal SMS, and the read tracking function disappears. This creates confusion: today you see check marks, and tomorrow, when a friend’s Internet connection goes down, the message is sent “blindly”.
Third-party applications and security risks
In the store Google Play you can find hundreds of applications that promise to return the read function for regular SMS. It is important to understand the mechanics of their work so as not to become a victim of scammers or violate privacy. Such apps cannot magically add capabilities to the GSM protocol.
Most of them work on the principle of intercepting notifications or require superuser rights (Root). To implement tracking, it is often necessary that the application be installed on the recipient's phone, which turns it into a spying tool. Installing such software on someone else's phone without the owner's knowledge is illegal in many jurisdictions.
Apps that require broad permissions to access contacts, call logs, and message history pose a serious security risk. They may collect your personal data and transfer it to third parties. Often, malicious code is hidden behind a beautiful interface.
⚠️ Attention: Never grant root access to applications that promise “secret functions” for SMS. This can lead to complete compromise of your device and theft of banking data.
Even if the application claims to work without installation on the recipient's phone, use critical thinking. Technically, this can only be achieved through hacking the operator’s servers or exploiting vulnerabilities in the OS, which is a cybercrime. There are no legal methods.
How do legal corporate solutions work?
There are services for business that use special SIM cards and gateways. They can receive advanced statistics, but these are paid services for legal entities, and not for ordinary users.
Differences between SMS, MMS and Internet messengers
Users often confuse different types of messages, expecting the same functionality from them. To avoid disappointment, it is necessary to clearly differentiate between technologies. Each of them has its own data transfer protocol and status confirmation capabilities.
The table below clearly demonstrates the capabilities of various communication formats in the context of status tracking:
| Message type | Transmission channel | Status "Delivered" | Status "Read" |
|---|---|---|---|
| Classic SMS | Cellular network (GSM) | Yes (optional) | No |
| MMS | Cellular network (GPRS/3G/4G) | Yes (often) | No |
| RCS (Chat) | Internet | Yes | Yes (upon setup) |
| WhatsApp / Telegram | Internet | Yes | Yes |
As can be seen from the data, only Internet protocols allow you to see the fact of reading. This is due to the fact that the client application on the recipient's phone sends a special data packet (accelerator) to the server when the conversation is opened. In the case of SMS, such a mechanism is not available at the standard level.
If it is critical for you to know whether a person has read the message, the only reliable way is to go to the messenger. However, there are nuances here: the user can turn off read receipts in the privacy settings, and you will again be left in the dark.
Setting up delivery reports on popular Android models
Although we can't know if someone has read them, setting up a delivery report will help make sure that the message at least reached the device. The interfaces of different shells Android are different, so let's look at the instructions for the most common brands.
On devices Samsung with a shell One UI the process is as follows. Open the messages application, click on the three dots in the corner, select Settings. Next, find the item Additional settings and activate the switch Delivery reports. Now you will receive a system notification upon successful transfer.
In smartphones Xiaomi (MIUI) the path is a little different. Go to messages, click on the profile icon or gear. In the section SMS find the option Service messages or Delivery reports. In some firmware versions, this function may be hidden in the menu Advanced.
☑️ Checking report settings
It is worth considering that even with the setting enabled, the report may not arrive. This happens if the recipient's phone is turned off longer than the lifetime of the message on the network (usually from 24 to 72 hours), or if the subscriber is in roaming with restrictions on service SMS.
Delivery report is the only legal and technically possible metric in the world of classic SMS. Everything else is either work via the Internet (RCS) or deception.
Alternative ways to confirm receipt of information
When standard means do not provide a complete picture, you have to resort to social engineering techniques or changing the communication channel. If the question is really important, do not rely on technology alone.
The simplest method is to ask for confirmation in the text of the message. Phrases like “Confirm receipt” or “Write 1 if read” work flawlessly, as they require conscious action from the recipient. This moves communication from a passive to an active phase.
Calls can also be used. If the message is urgent, it is better to call. Modern smartphones show whether a call was accepted, even if it is not answered. The combination of SMS and call increases the likelihood that the information will be noticed.
⚠️ Attention: Charging conditions for incoming and outgoing messages may vary among different operators. In roaming, receiving delivery reports is sometimes charged as incoming SMS. Check the current conditions in your operator’s personal account.
For business correspondence, it is recommended to use corporate instant messengers or email, where there are mechanisms for requesting read receipts. These tools are created specifically to record the facts of communication.
Frequently asked questions (FAQ)
Is it possible to find out whether an SMS has been read if the recipient has an iPhone?
No, it is not possible. The iMessage protocol only works between Apple devices. If the message is sent as a standard green SMS on the iPhone, the same rules apply: only a delivery report is possible, but not a read report.
Why do I receive a delivery report, but the person says that he did not see the message?
The report means that the phone received the signal and saved the message in memory. The notification might not appear on the screen due to Do Not Disturb settings, spam blocking, or simply because the user did not log into the messages application.
Are there secret codes for read receipt?
No, such codes do not exist. USSD requests (starting with * and #) are used to manage operator services, balance and tariffs. They do not have access to personal data on other people's phones.
Does airplane mode affect the receipt of a delivery report?
Yes, it does critically. If the recipient is in airplane mode, the message will not be delivered and the report will not arrive. The report will be generated only when the subscriber turns off airplane mode and the phone registers on the network.
Can the telecom operator provide read information?
The telecom operator stores data about the fact that the message was delivered to the device (time and date), but does not have the technical ability to track the moment the user opened the message. This information is not physically transferred to the network.