> A SIM-card is something you need to wait to arrive in snail mail. When going abroad you need to order one ahead of time to get a good price. Switching requires weeks of waiting for new cards to arrive, or going to a store. If you lose your device you need to wait for a replacement.
What do you mean? You just pay a small amount of money at any store/cigarette shop and you get a SIM card in 10 seconds.