Restoring my iPhone from iCloud?

I'd like to know how to restore my iPhone from iCloud. It's activated already and I can't erase all my settings and go through set up again because I don't have a sim anymore. How can I restore it?

The first 30 days you can call Apple Care and they will help you with every conceivable problem.

If you're within its first 30 days you can go to Apple store and purchase a warranty that doubles repair time as well as technical support.

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