Which of the following is NOT a responsible way to dispose of an old smartphone after removing your data from the device?

A) Donate it to a charity.
B) Remove the battery and throw it in the trash.
C) Trade it for credit at a technology store.
D) Take it to a recycling facility.

Removing the battery and throwing it in the trash is not a responsible way to dispose of an old smartphone as batteries contain hazardous materials that can harm the environment. The best choices would be either to donate it to a charity if the device is still usable or take it to a recycling facility where it can be disposed of properly and any reusable materials can be extracted for future use. Trading it for credit at a technology store is also a responsible option, as it ensures that the device will be recycled or disposed of properly.