Can't on iPhone due to ios 7

I had installed ios 7 recently. But when I wanted to downgrade back to ios 6, I did an restore on the phone via iCloud. Now I couldnt register my phone as its under apple developer. Couldnt use my phone now, Help!

Take out the battery and your SIM out. Put them back and connect it to iTunes, it should get fixed.

If you aren't a developer as it warned and you tried to install the beta anyways, then you are just asking to end up with a phone that no longer works. It will ask you to enter a developer password and if you don't have that then you are hosed. Anyone that simply avoids the warning deserves to have their phone bricked.
Wait for the official version to be released as its only beta now anyways. (I do really like what I see with iOS 7 though! But I also have no interest in a beta version and want the real thing when its released)

You can't brick a iPhone all you have to do is put your iPhone in recovery mode and restore I'm iTunes

Restore your iphone

There are many cheaper way to pay 99$/year for Apple to download iOS7, you can search some gig in Fiverr with 5$
Something like this
http://fiverr.com/apple_review/activate-your-udid-to-have-ios-7-on-your-iphone-within-5-minutes

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