Runescape Membership Question

[vegitto777]

On the site it says you can send a SMS message using a cell phone for membership. I am wondering what would happen if i do this with a pay as you go phone? I currently own a tracphone..where you buy cards with minutes. So if i do this what will happen?

 

[BladeofSerenity]

It would just take off the amount off the card? Best guess i know

 

[vegitto777]

Every text message takes off .5 so...how much will it take off? lol.. i have a "Net 10" phone.