Will my sim work?

[boris505]

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 before I know for sure. Thank you so much for any help!

 

[Shadowriver]

Any GSM sim will work on any GSM device, only possible restriction is sim-lock on device which restricts device to work with specifc carrier, but even if there is sim-lock it's probably unlockable