It's gone, I can double tap, switch back to the pencil, and now I'm writing again.

擦除了，继续轻点两下，切回到笔，又能用来写字了。

Another discovery is that you can dial a phone by just tapping the hook switch, that little button where you hang up.

另一个发现是，您只需轻按挂断开关（挂断电话的小按钮）即可拨打电话。