Most popular mobile billing?
 

Are the majority who join mobile paysites still entering cc info through their phone or do most people do the phone billing option?

US and Canada - credit cards

Europe - phone billing

Try www.dialxs.com for European phone billing, sms, etc.
Do ask them for the payout rates. Why settle for 0,19$ per minute if you can get 0,65$ or more for example Holland at the same consumer billing rates per minute being 0,80.