They never asked me for phone number. Where are you from?
did read they don't let your page index anyway unless you are a paying member there ....... thats true ?
It doesn't seem to be a new issue: http://www.blackhatworld.com/seo/so-weebly-needs-cell-phone-verification-now.471365/
You can try what others suggested, delete cookies and use a different ip, i think a free VPN, Hola will do, you don't necessarily need private proxies for this. If it doesn't work with US ips, try different countries.
How many accounts have your created so far? If you linked all with the same @domain, that might be it unless you used a free provider like Gmail, Yahoo etc.