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    The WhoWho app can bring the phone numbers of the USIM, but when the number is changed, it is not automatically updated, so even if it's not convenient, you need to delete the WhoWho app and reinstall it.

    After reinstallation, if you register with the same email account you used in the WhoWho, you can bring up the basic information, block number, secured number, shared number, reported number, and memo again.

    Please note that if you resign before reinstallation, all existing information will be initialized. After re-installation, please make sure to request the deletion of the previous number through inquiring in the WhoWho app.

    ※ If the number does not change even after reinstallation
    Smartphone settings> Application management> WhoWho > Delete cache > After deleting data, launch the WhoWho app again
    (If there is a problem even if you step no.1, please try no.2)
    2. Remove the USIM from the smartphone> Delete data of WhoWho (step no.1)> Reboot the smartphone> put USIM > Launch the application WhoWho again
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    The Whowho is a wireless internet-based search service, it should be connected Wi-Fi or data.

    It means, if the use of the wireless internet is stopped or the connection is poor, you cannot check the information about the unknown phone number provided by the app.
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    The WhoWho does not charge a separate fee as a free service, and ""call and texting function"" in the WhoWho app is connected to your smartphone, so it is applied in the same way with the mobile payment plan.

    Also, when you making/receiving phone numbers, you will use the wireless Internet (Wi-Fi, data) that connected to your smartphone to search for the number in the notification window.

    Please note that when you connect with data, you use a small amount of data that search the portal site on the Internet.
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    It isn't supported the group management/synchronization for account contacts of Exchange format such as Google and Yahoo, etc on Apple's iOS.

    Therefore, if you are using iPhone contacts as an account contact in the Exchange format, you may see the group created using other services, but you cannot use the group management function in the group of App Contacts on the WhoWho app.
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    Please check the current conditions in the following orders.
    1) Please check if the app is set to possibly access the phone.
    -[iOS 10] Open iPhone 'Settings'> Phone> Call Blocking & ID> Enable the 'WhoWho'
    -[iOS 11] Open iPhone 'Settings'> Phone> Call Blocker and Caller ID> Enable the 'WhoWho'
    2) Please update the information of the number provided by the WhoWho app to the latest information. (Recommended once a day)
    -Run the WhoWho app> Select 'Number ID' tab> 'Update latest information'
    3) (KT users only) Please use the ""Real-time caller information notification"" function.
    If you sign up for 'WhoWho spam notification', a free supplementary service for mobile operators, you can check the information of the number updated in real-time.

    ※ You can enjoy a high synergy effect when used with the Fuhu app.
    -After running the app> 'More' tab> General settings> Real-time caller information display> Sign up / cancel> Sign up for additional services
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    Real-Time Caller Information Notification"" is a free supplementary service for wireless carriers that displays caller information of unknown numbers in real-time.

    Currently, it is only available to users of KT carriers, and a free additional service, 'WhoWho Spam Notification' is provided.

    <How to sign up and cancel>
    -Run or run the WhoWho app (v2.4.0 or higher)> 'See More' tab> General settings> Subscribe or cancel through 'Show real-time caller information'
    ☞ The menu is displayed only for users of KT carriers.

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    Apple does not allow other company manufactured services to access calls and text records.

    Therefore, for now, only the call history made through the WhoWho app is displayed as 'recent records' at the top of the keypad.

    ☞ The menu is displayed only if there is a record of calls made through the app.

    Please understand that we are trying to find a way to display the recent records.
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    If there is a recorded phone call is called on WhoWho app, 'Key Pad' > Recent recorded history > 'Edit' you can delete on this menu.
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    iPhone does not provide the ability to block text messages from third-party services due to Apple's policy.

    Therefore, if you register as a blocking number in the WhoWho app, only the incoming call is blocked, and if you update the iPhone to iOS 11, you can use the 'spam message filtering' function provided by WhoWho.

    If you use this function, in addition to the numbers you have blocked, spam messages received from unknown numbers are automatically classified into 'junk' message boxes.

    Also, if you use advanced options, you can set the filtering conditions yourself, such as registering keywords, starting numbers, or setting image message filtering.

    Messages categorized as 'junk' mailboxes have the same effect as blocking, as arrival notifications are not triggered. (Similar to the email's spam mailbox)

    <How to set spam message filtering_Support iOS 11 or higher>
    Open iPhone 'Settings'> Messages> Unknown Contacts & Spam> Enable the 'WhoWho' app
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    Spam Message Filtering' is a function that automatically classifies spam text messages into the 'Junk' message box (spam message box) of the iPhone message app through the app.

    Messages classified as the 'Junk' mailbox in the iPhone Messages app do not trigger a message arrival, so they can have the same effect as blocking (similar to a spam mailbox).

    The following messages are classified in the 'Junk' message box of the iPhone message app.
    1) The number that I blocked directly from the app
    -WhoWho App> 'More' tab> Number registered in 'Block Management' (except for numbers stored in contacts)
    2) The number of users who report spam
    3) Advanced filtering options set by the user
    ※ WhoWho App> 'More' tab> 'Message Filtering'> Advanced Filtering Options
    -Keyword filtering: Message containing the registered keyword
    -Filtering the starting number: the number starting with the registered number
    -Image message filtering: Message that receives only image files without text content

    <Setting method_iOS 11 or later supported>
    Open iPhone 'Settings'> Messages> Unknown Contacts & Spam> Enable 'WhoWho'