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iphone 4 No service after ios 7 update


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May 13, 2014
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Hi, I have this phone, that basically has troubles in finding the network.
By pressing home+hold, sometimes it goes fine, but if I put it into flight mode and back, again it's not able to find the network.
Some others it doesn't even succeed in booting, being stuck at the apple logo screen, trying over and over.
I am not familiar with Iphones, but I would like to figure out whether it's an hardware issue or not, before coming to the conclusion that I'm not going to use it as a phone any more.
Thank you very much in advance
If the device was working perfectly prior to the update, I'd recommend restoring to iOS 7 as opposed to your update. You should also check to see that the SIM card isn't corrupted or damaged if it was not working before as well or if you received it directly on iOS 7 and never tried it before.