Talk:Japan/@comment-2.61.135.130-20150815150431/@comment-24682153-20150815205213

1.) Yes, sure you have to give it back. That's the nature of a rental. In contrast to purchase / buying a SIM card.

2.) This function is normally called tethering. It normally works in Japan. But you should check first with the rental company if there are specific restrictions on your particular rental SIM card.