Noob question here guys / gals,

I have a Bold and currently a Maxis customer on an unlimited data package + BB service (about RM120) and also on a value RM150 plan. I have ONE supplementary line and on the Friends / Family Package.

I intend to buy the 3GS for its amazing library of applications but not ditch the BB due to superior push technology.

My noob-like question is as follows:

1) What are my ONLY options to get the 3GS without paying anymore since i'm happy with my Value Rm150 and the unlimited data package + BB Service?

2) I actually have 2 sim cards for my main line (on the Bold). I have 2 because i lost one last time, got a new one, days later, found the old one. Let's say somehow or rather i now own the 3GS; if i put my other 'spare' sim card inside my 3GS, would i still be able to surf (data) on both my Bold and 3GS at the same time? And what happens to voice calls now; which phone would ring if both phones are turned on?

Thank you in advance.