iOS Blue Number Detection Practical Guide: How to use blue number data to improve reach rates in outbound marketing
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iOS Blue Number Detection Practical Guide: How to use blue number data to improve reach rates in outbound marketing
One of the most troublesome problems for the outbound marketing team is: the number cannot be connected and iMessage cannot be sent, which is a waste of time and budget. iOS blue numbers—i.e., numbers whose device is an iPhone and iMessage is functioning properly (showing a blue bubble)—represent higher reach potential. This article will focus on iOS blue number detection, explaining its concept, detection methods, combination with outbound call scenarios, and how to complete blue number screening in batches through the KK-DATA platform.
What is an iOS blue account? What does blue number have to do with outbound marketing?
The definition and identification criteria of iOS blue number
“iOS blue number” is not an official term, but a common name in the marketing circle for the number whose device is iOS and iMessage is activated/valid. When you send an iMessage on your iPhone, if the other party is also an iOS device and iMessage is turned on, the message bubble will appear blue; conversely, if the other party is an Android device or iMessage is turned off, the message bubble will appear green. Therefore, blue number = blue bubble = number that can reach iMessage.
Discriminating blue signs usually requires detection of two dimensions:
- Device type: Whether it is an iOS device (identified based on device characteristics).
- iMessage Validity: Whether the number is registered for iMessage and can receive messages.
Why do outbound teams need to pay attention to iOS blue accounts?
In the outbound scenario, whether it is a phone call or iMessage push, blind typing and blind push will lead to a large number of invalid contacts. The value of the blue number is reflected in:
- iMessage delivery rate has been greatly improved: Only blue numbers can receive iMessages, and green numbers can only send text messages (high cost and low open rate).
- Reduce the risk of being reported: Sending iMessages to non-iOS devices may be judged as abnormal behavior, resulting in Apple ID being blocked.
- Improve user response rate: iOS users are generally more willing to open iMessage letters than text messages or emails.
Blue number ≠ number is valid
iOS blue number detection only means that the device is iOS and iMessage is valid, but it does not mean that the user is active or willing to receive marketing content. Before making actual outbound calls, user authorization and channel rules still need to be combined to avoid harassment.
How to detect iOS blue numbers in batches? —— KK-DATA three steps
KK-DATA provides the “iOS Blue Number Detection” capability (located under the “iOS/iMessage” detection type in the console), which supports batch detection of iOS device status and iMessage validity of numbers. The following is standard operating procedure.
Step 1: Generate or import target number
- Global Number Generation (Free): Select the target country/region (such as the United States, United Kingdom) in the console, and the system will randomly generate a large number of available potential numbers. You can also upload a custom number segment CSV file or import it from historical data.
- Number segment strategy: For iOS blue numbers, give priority to the number segments with a high iPhone share among local operators (such as some number segments of AT&T/T-Mobile in the United States). The generation module supports 240+ countries and can be customized as needed.
Step 2: Select the “iOS Blue Number” detection type in the console
- Log in to KK-DATA Console.
- Click “New Screening Task” → select the detection platform as “iOS/iMessage”.
- Check “iOS blue number detection” in the detection type (some interfaces display it as “iOS device detection” or “iMessage validity detection”).
- Upload the number file (up to about 1 million), and the system will estimate the deduction amount (see the real-time price on the console for details).
- After submitting the task, the platform will automatically start detection.
Step 3: Export the blue number results and use them for subsequent outbound calls
Once the task is completed, the results can be exported from Task Details. The export format supports CSV and TXT, and the fields include:
- number
- iOS device or not (yes/no)
- iMessage validity (valid/invalid)
- Other optional fields (such as iOS version, operator, etc., subject to actual export)
The blue number results can be filtered out separately and can be used in iMessage outbound calling tools or self-built push systems.
Blue number vs. ordinary number: Comparison of outbound call opening rate (intuitive difference)
| Number type | iMessage delivery rate | SMS cost | User willingness to open (speculated) | Applicable outbound call channels |
|---|---|---|---|---|
| iOS Blue Number | High (80%+, depending on the network) | No SMS charges | High (iMessage native experience) | iMessage, Facetime |
| Ordinary numbers (including green numbers) | 0% (send iMessage) | SMS fee required | Medium (messages are easily ignored) | SMS, voice |
As can be seen from the table, blue number detection can help you accurately locate users that can be reached by iMessage from a large number of numbers, avoiding wasting marketing resources on green numbers.
best practices
It is recommended that the blue number be used first for iMessage marketing, and the ordinary number should be used with text messages or voice calls as a fallback. For example: First push iMessage to the blue number, and users who have not opened it will be contacted by SMS after 24 hours.
Precautions for iOS blue number screening in outbound call scenarios
Compliance first: user consent must be confirmed before making outbound calls
Whether it is iMessage or SMS, most countries (such as the US TCPA and the EU GDPR) require user consent. The blue number screening only solves the problem of “accessibility” and does not change the compliance requirements. It is recommended to send only to users who actively subscribe or explicitly authorize it.
Blue number detection combined with deduplication warehouse to avoid repeated deductions
KK-DATA’s data deduplication warehouse can automatically identify detected numbers across tasks. For example, the blue number detected last week will not be billed again when new numbers are imported this week. It is recommended to upload to the deduplication warehouse before each new task to save budget.
How to match the blue number with the Telegram/WhatsApp screen number after detection?
Many overseas teams operate multiple social media outlets at the same time. After blue number detection, if the number is also activated on Telegram or WhatsApp, device preference analysis can be superimposed. For example, users with an iOS blue account and active Telegram are more suitable for sending Telegram invitations; users with only a blue account but without WhatsApp activation can take the iMessage route. KK-DATA supports cross-screening in multiple tasks within the same platform.
Case Demonstration: A Complete iOS Blue Number Outbound Call Playbook
Background: An independent website team plans to promote a paid App (iOS version) to American users. The budget is limited and they hope to minimize invalid push.
Execution process:
- Generate US number segment: Select “United States” in the KK-DATA generation module to generate 500,000 potential numbers (free).
- First blue number detection: Submit the detection task, which takes about 2 hours, and the results are obtained: 12,584 iOS blue numbers (about 2.5%).
- Data Deduplication: Import the blue number into the deduplication warehouse, and subsequent retesting of Telegram activity will not be billed repeatedly.
- Outbound call test: Send app download links to 12,584 blue numbers via iMessage. The open rate reached 6.8% (previously, the open rate of blind text messages was only 1.2%).
- Second Optimization: For users who have not opened the app, WhatsApp messages will be added after 24 hours (whatsapp activation test needs to be done first), and the final open rate will be further increased to 9.5%.
Before and after comparison:
- Before: Blind typing of 500,000 numbers, high text message cost (assuming $0.02 per text message), and low open rate.
- After: After the blue number is detected, only 12,584 iMessages (free) are sent, the open rate increases by more than 5 times, and the number can be reused for other channels in the future.
FAQ
**Q: Can iOS blue number detection detect whether the user is online? **
Answer: KK-DATA’s iOS blue number detection is mainly used to determine whether the device is iOS and iMessage is valid (blue bubble), and is not equivalent to real-time online detection. If you need more detailed activity data (such as recent online time), please pay attention to subsequent updates of the product or combine it with other social platforms for testing.
**Q: How accurate is the blue number test result? **
Answer: The platform verifies equipment characteristics through multiple factors, and the results have high reference value. However, some numbers may be misjudged due to network blocking and system settings (such as turning off iMessage). It is recommended to conduct secondary verification based on the actual business (such as sending test messages).
**Q: Can I use blue number data to send iMessage directly when making outbound calls? **
Answer: Yes. However, you need to comply with Apple iMessage and local anti-spam regulations (such as the US CAN-SPAM Act). Blue number screening can reduce invalid sending and reduce the risk of being reported, but it still needs to ensure that users agree to receive it.
**Q: Is the testing cost expensive? What is the billing method? **
Answer: There is no subscription package, and the fee is based on the number of tests. iOS blue number detection belongs to the “iOS/iMessage” category. For specific unit prices, please log in to the console to view the real-time price. For details, see Billing Instructions. The estimated cost will be displayed before submitting the task.
**Q: What should I do if the generated numbers are not enough blue numbers? **
A: Global number generation is free. You can combine the target country’s number range and operator preference (such as the US AT&T number range) to generate more potential numbers before testing. Cooperate with the data deduplication warehouse to avoid duplication and waste.
If you want to experience iOS blue number detection immediately and improve the outbound call reach rate, you can start now:
👉Log in to the console to start screening numbers Two-way contact customer service: https://t.me/kkdata_robot Learn more: Official website | Usage documentation
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