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No matter what version you are working with, like i OS 9, i OS 9.2.1, i OS 9.3.3, i OS 9.3.4 or the last i OS 9 update - i OS 9.3.5, if you have any problem when or after update, be free to check this guide and find solutions to fix. We have seen a few i Phone users complain about the Cellular issue, it is not working after i OS 9 update, but there is no problem with Wi-Fi connection. Generally speaking, there are two common ways to upgrade to i OS 9: update with i Tunes or OTA (Over the Air).