How to Fix iPhone Activation Error after iOS 11 Update

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What to Do If I Can't Activate iPhone After iOS
11 Upgrade

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  -activation-error-after-ios-update.html

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Even though a new released operating system comes
with cool features and improvements, and also fix
some little bugs on iPhone/iPad/iPod, however, it
may also cause troubles to your device, for
example, you can't activate your iPhone after iOS
11 update. It is not strange but common when a
new iOS is available. So this article is about to
show you how to fix iPhone activation error after
iOS 11 update for your reference.
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Reasons Why iPhone Fails Activation after iOS 11
Upgrade
Actually, besides software update, the iPhone
activation error may also occur after you restore
your iPhone to factory settings. Anyway, if you
can't activate your iPhone after iOS 11 update,
there are several possible reasons to cause this
issue.
See Also How to Fix iTunes and iPhone Errors?
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1. Busy Apple Server. When a new iOS is
available, there should be plenty of Apple device
users are trying to update to iOS 11 and this
needs Apple Server to deal with them at the same
time. It is very easy to cause high traffic and
may cause the activation server gets temporarily
unavailable or overload when you try to activate
your device. 2. iPhone is not recognized. If so,
there should be certain local errors preventing
your iPhone from contacting the activation
server, such as some issue from your carrier, the
malfunction or absence of SIM card on your
device, or Wi-Fi cannot connect. 3. iTunes is
unable to verify your iPhone. There is another
possible reason that iTunes can't verify your
device due to wrong login details. Before going
further, please make sure your network condition
is good, no matter you have connected to Wi-Fi
network or cellular data on your device. And in
case of data lost, you'd better backup your
iPhone data via iTunes or iCloud before trying
the following solutions.
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Solution 1. Hard Restart Your iPhone to Fix
Activation Error
To get rid of iPhone activation error, you can
hard restart your iPhone to give it a fresh
restart. It really works on some little problems
on device like this. To hard reboot your iPhone,
you can follow the instructions as below
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Step 1. Please press and hold the "Power" button
and the "Home" button ("Volume Down" button on
iPhone 7/7 Plus/8/8 Plus/X or later) at the same
time, don't let go until the Apple logo appears
on screen. Step 2. Wait for a while till iPhone
screen goes completely black. Then hold the
"Power" button to turn on your iPhone again. Now
you can check if this problem has been fixed or
not.
See Also How to Solve iPhone Stuck in Boot Loop?
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Solution 2. Activate iPhone via iTunes to Fix
iPhone Activation Error
Alternatively, you can use iTunes to activate
your iPhone instead. To do so, you can check the
following steps. Step 1. Please launch iTunes on
your computer and connect your iPhone to computer
with a USB cable. Step 2. If you have not
activated your device, iTunes will prompt you to
"Activate iPhone" on the interface.
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Step 3. Please select the "Activate iPhone"
option and enter your Apple ID and password as
prompted, then hit "Continue" button to activate
your iPhone.
See Also How to Fix iPhone Stuck on Verifying
Update
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Solution 3. Restore iPhone to Factory Settings to
Fix Activation Error
If you still fail to activate your iPhone, you
can try to reset iPhone to factory settings. It
is a common and effective way to fix unexpected
iOS issues. Importantly, please remember to
create a backup of your iPhone contents before
restoring iPhone. Step 1. To reset iPhone,
please unlock your iPhone and open Settings
app. Step 2. Then please tap "General" gt "Reset"
gt "Erase All Content and Settings" option.
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Step 3. Enter your passcode and tap "Erase
iPhone" option to confirm your action and start
to restore iPhone to factory default
settings. After restoration, you can try to
reactivate your iPhone and see if the iPhone
activation error has been fixed.