Whenever there is a new iOS update, users will experience more new features that Apple launched for you on your iPhone. Accompanying these experiences will be errors of new updates that can be annoying to users.
Recently a mobile data connection error, many iPhone and iPad users complained that they could not connect to 3G / 4G after updating to iOS 12.1.2 version. Currently, Apple has not provided a patch yet, so you must fix the network connection error by following the instructions of IOSTips.
How to fix errors that cannot be used on iOS 12.1.2 network
Step 1: First go to your installation application, select Mobile. Next select Mobile data option, remember to turn on 3G / 4G before doing so.
Step 2: In the Mobile Data Options menu, select Turn on LTE, to the right you will see two items: Off and Voice & Data and Data Only, in which you should select Voice & Data and then exit out.
Next, your system will automatically scan the network on the device and drag the Control Center from the bottom up, then turn on Mobile Data to reuse 3G / 4G of the device.
So you just fix the iPhone 3G / 4G error, note that those using MobiFone SIM will not fix this error because in the Enable LTE section there will be no Data Only feature.
If you are lucky to be free of this error, you can enjoy the new features that iOS 12 brings, such as setting the time for an application, checking new battery usage information, activating temporary features When not disturbing for a certain period of time ... Many other features that you can explore and experience, refer to the list of new features and tips on iOS 12 in the article New tricks on iOS 12 you should know.
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