Will my sim work?

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http://forums.androidcentral.com – Ok, so to start Iv'e been wanting to use the BYOD program straight talk is offering, unfortunately i need the AT&T sim to get coverage in my area. However, I've been using straight talk with an LG840G phone that i bought from straight talk a while ago. The sim inside this phone is an AT&t one and i was wondering if I could use it in my new compatible phone. Basically is there anything different about the official AT&T straight talk sims that allow them to work in gsm compatible phones, or would my old sim work? Also I would need to cut my sim down which is why I'm scared to try bef (HowTos)