This can happen if you tried to order a yallo mobile subscription, but your request was unfortunately rejected by yallo for reasons unknown to us. yallo then sent you a free swype SIM card to the address provided as an alternative solution.
You can try out the swype SIM card for free for one month (swype Swiss rate for free). The SIM card is not registered under your name. It is also a blank SIM card that is only activated when it is registered with swype via the swype app and linked to a phone number. You are under no obligation whatsoever to activate or use this SIM card. You can also give it away as a gift or dispose of it.