Flashing custom ROM on phone

MrTuRtLe03

Honorable
Jun 20, 2012
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0
10,570
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Hello everyone!

I want to flash a custom ROM on my phone, a Galaxy S 3 i9300 (I have done this dozens of times before, but never with a cell phone. Usually just tablets and such). Would this affect my carrier or anything. My carrier is US Cellular, and the phone is in working condition with a 4G LTE activated SIM card in it. Would I need a new SIM, the SIM re-activated or the SIM paired with the phone (not even sure if the third thing even exists) after flashing the ROM, or would it just work after I install a version of Cyanogen? I apologize if this sounds really stupid to you, but cell carriers really is not my strong point.

Thanks for all the help in advanced! Have a nice night!!

 
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