I have this pretty old simcard, used in several phones over the years and its kinda worn-off

My girlfriend noticed when using my simcard for updating OTA (i have this free internet over 3G thingy) on his Nokia 5230 was heating up than normally... (after updating ofc.)

Does it take more voltage to get proper connection to simcard when its warn-off too much and cause heat? My N900 is kinda warm even on idle.