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I still think it's the best to let submitters fill in their phonenumber.
Most people don't have too many phonenumbers and with a few questions you could verify it's them and not a friend of them or so.
Problem with paying a fee is that they need a paypal account and not everybody has a CC.... expecialy none US people. Plus with paypal you can just signup under a new e-mail address.
I think it's easier to get a new e-mail address then to get a new phonenumber
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