Straight Talk Or ??

I currently have AT&T xxx minutes unlimited text( NO internet) LG cu 515.. How can i tell what sim card i have if it is straight talk or what ever I have?? I can currently take out my sim & put it in my wifes phone & it works..
I'm wanitng to get a unlocked iphone 4 & hopefully put in a micro sim or current cut down sim & use the iphone as i did my LG cu 515.

---

› See More: Straight Talk Or ??

I had the same issue a while back, but I switched to Straight Talk and the sim card for AT&T does not work with ST. If in the household the family has the same company either ST, NET10, AT&T or any other then the sim card is useful for the same company cellphones. I have no complaints with my Straight Talk cellphone Samsung R355c. The only thing you need per month is either $30 or $45 which is an unlimited plan. The savings start as soon as you switch.