Fixing network unlocking errors with a SIM interposer helps resolve the situation where locked iPhones fail to recognize SIM cards, thereby meeting users' needs for calling, browsing, information lookup, and entertainment.
Fixing network unlocking errors with a SIM interposer - an essential skill when using locked iPhones
Locked iPhones in Japan are favored by Vietnamese users due to their low prices and guaranteed quality. However, a drawback of locked iPhones is that they only work with SIM cards from specific carriers. When you bring a locked iPhone from Japan to Vietnam, you cannot insert a Vietnamese SIM card to use it. Moreover, even when using the locked iPhone in Japan, it may not recognize certain SIM cards if they are not compatible with the device.
To address the issue of locked iPhones not recognizing SIM cards, you need to use a SIM interposer. A SIM interposer is a small circuit board that resembles a small piece of metal.
A SIM interposer is indispensable when using locked iPhones.
How to use a SIM interposer: Insert the SIM interposer over the current main SIM card you are using. The SIM interposer will then unlock the network of the locked iPhone. For this reason, a SIM interposer is associated with the term "holy grail."
After inserting the SIM interposer, you can use the current main SIM card as usual. Additionally, after inserting the SIM interposer, the locked iPhone will become an international iPhone, with a wider range of SIM card compatibility.
Fixing SIM interposer contact list error on iOS 13
The SIM interposer is considered a holy grail SIM card that helps the locked iPhone become an international iPhone, enabling compatibility with various Japanese SIM cards. However, when inserting the SIM interposer into a locked iPhone, various SIM interposer errors may occur. The most common one is the contact list error.
Symptoms of the contact list error include missing names in the contact list or only showing numbers without names, causing inconvenience to users. The reason for this error is that Apple continuously scans and blocks ICCIDs for SIM interposer types to limit users from using locked iPhones as international ones.
Therefore, to continue using the SIM interposer on a locked iPhone, you need to fix the contact list error on iOS 13.
To fix the SIM interposer contact list error on a locked iPhone, go to the App Store and download the Edit Contact Professional app to your device.
Step 1: Open the Edit Contact Professional app => select OK to allow the app to access your contact list => go to Utilities => find Edit prefix numbers.
Step 2: In New prefix, change +1 to +84 => press Edit => find Sure to confirm.
After fixing the contact list error with the SIM interposer on iOS 13, you can make and receive calls with the full display of names and numbers.
Fixing SIM interposer error on iOS 13
SIM interposer errors are common when inserting a SIM interposer into a locked iPhone, possibly due to the SIM interposer not being compatible with the operating system version. In fact, locked iPhone users who update to iOS 13 often encounter errors such as the contact list error mentioned above or the error of not recognizing the SIM card when inserting the SIM interposer. Therefore, fixing SIM interposer errors on iOS 13 is crucial for users.
SIM interposer cannot make calls error
The SIM interposer cannot make calls error is also a common issue when using a SIM interposer for locked iPhones. If the SIM interposer you insert into the locked iPhone does not allow you to make calls with the main SIM card you are using, it means that the area where you are using the phone does not have signal coverage, or the SIM interposer is damaged, or your installation process is incorrect.
How to fix SIM interposer cannot make calls error?
First, check if the area where you are using the phone has signal coverage or if the signal is weak.
Incorrectly attached SIM interposer: Remove the SIM interposer and reattach it.
Faulty SIM interposer: Since the SIM interposer is very thin, you can easily damage it during the installation process. In this case, fix the SIM interposer cannot make calls error by purchasing a new SIM interposer.
SIM interposer cannot enable 3G error
The SIM interposer is a means for the SIM card in your phone to function normally on a locked iPhone. Sometimes you will encounter the SIM interposer cannot enable 3G error, which may be due to the following reasons:
Not within coverage area: It may be because your geographical location does not have the signal provided by the carrier, leading to loss of signal and loss of internet connection.
Faulty network SIM: The SIM interposer is not compatible with the locked iPhone, causing intermittent network, inability to read the SIM card, and SIM interposer cannot enable 3G error.
You are using Wifi concurrently with enabling 3G: These two types of internet networks cannot be used simultaneously. You must choose to turn off Wifi if you are using 3G.
Where to buy SIM interposer for unlocking locked iPhones?
SIM interposer is an essential item for Vietnamese users using locked iPhones produced in Japan, whether you are living in Japan or Vietnam.
To use the SIM interposer effectively, you need to know which carrier your locked iPhone is distributed by. Vietnamese people in Japan often buy locked iPhones and use network services from two carriers: SoftBank and Docomo, both of which are very famous. Therefore, the demand for buying SoftBank SIM interposer and Docomo SIM interposer has also increased recently.
The above is basic information about Japanese SIM interposer. Using a SIM interposer is a cost-effective and efficient method to use locked iPhones without changing the main SIM card or phone number. For more information about the types of SIM interposers available at Hallo and how to fix SIM interposer errors, please visit Hallo.co.
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