Difference between Non verified twitter accounts and verified twitter accounts

Hi, anyone know what's the difference between non phone verified twitter accounts and phone verified twitter accounts? Just like Facebook Non-PVA and PVA.

Thanks for your replies advance.

 

doesnt really matter either way. it matters more for facebook as it disables the captcha codes

 

Thanks for your reply.

I'd like to do some test for this case, but don't any phone verified twitter accounts, try to buy some, but there seems no such provider in the market.