My iPhone is not factory unlocked. Can I still restore it?

I have about 3.59 GB of the other and I've deleted history and cookies from Safari, deleted messages, apps, deleted my email account from the phone etc. But it's still the same. The only way I can think of getting rid of that massive other is to restore but I'm afraid that my phone will not be unlocked anymore. Can I still restore it? Are there other things that I can do to get rid of it without restoring?

Try PhoneClean. A free desktop app that should clean up more of those files.

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