If you change a sim card will you lose anything?

Answer 1

Usually the process, if done correctly with the absence of magetic erasing, will not make the sim card lose any data. But the sim card is delicate so try not to snap it in half.

Answer 2

Yes. Your SIM card holds some text messages and contacts. But, tacking it out wouldn't change anything because as soon as you return it to it's proper place the data would load.