is not
In theory, the Apple Watch charger can charge the phone, but in fact, because the power is too small, it is not recommended to use.
Apple mobile phone is not recommended to use wireless charging, because the power loss of wireless charging is too large, and the phone is easy to heat, which is unfavorable to the built-in battery, easy to cause the early failure of the battery, in order to make the battery use for a period of time, or do not use wireless charging to ensure that the battery has enough life.
No, it's not! Apple watch wireless charging does not have the purpose of providing power to the iPhone, sharing. If you buy a MagSafe wireless charging device, you can share it with your iPhone.
Yes, it's shared, because it's all Apple products