HT201407: If you can't activate your iPhone

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Ats4ever123
Level 1 (0 points)

Q: Unknown device can anyone help on iphone 4 after upgrading to ios7

I upgraded to ios 7 on my iphone 4 it says unknown device can anyone help

iPhone 4, iOS 7.0.2

Posted on Dec 27, 2013 4:49 AM

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Ats4ever123

Q: Unknown device can anyone help on iphone 4 after upgrading to ios7

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  • by David Ostler,

    David Ostler David Ostler Jul 29, 2014 2:27 PM in response to Ats4ever123
    Level 1 (4 points)
    Wireless
    Jul 29, 2014 2:27 PM in response to Ats4ever123

    I fixed it!!!  Here's my story.  After updating to iOS 7 I would get the "UNKNOWN DEVICE" error and I could never activate my phone.  I tried it off and on for about six months and suddenly it worked.  Then I made the mistake of updating to 7.1.2 and once again I got the "UNKNOWN DEVICE" error.  I tried many many times to get it to work again but nothing seemed to work.  After thinking for a while about why the it suddenly activated after six months I wondered if it was because it was winter and my home was very cold at the time.  Then I stuck my iPhone 4s in the freezer for a few hours and tried again and viola, it worked!  I'm curious to see if this little trick will work for others.  Good luck!