Oh No! My sincere apologies that you may be having issues with iTunes. Having access to update your device is definitely important. Do you have access to a WIFI connection? Have you attempted to reach out to Apple for assistance with the update via iTunes? They can be reached at 1-800-MYAPPLE. Please keep us posted, thanks!
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If your Close to a Verizon Comm Store go in, tell them your having trouble updating your phone ask if they can help assist you in updating it.. Give that a try before you give up to go to another Carrier.. b33