how do i flash a custom ROM

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i asked about removing a white sim card and the answer was to flash a custom ROM i don't know how or what it is
 
Welcome to Android Central! Which phone? What do you mean by removing a white SIM card? You can physically remove the SIM card. Are you asking how to carrier-unlock a phone?
 
If it is a symbol in the status bar at the top of the screen, perhaps it means that there is trouble of some sort with your SIM card, or your microSD card.