If you place a dead phone without its casing into a freezer for an extended period of time, several things could happen:
Condensation: When you take the phone out of the freezer and return it to a warmer environment, moisture from the air can condense on its components. This condensation could cause water damage to the phone, potentially leading to corrosion or short circuits.
Potential Damage: Extreme cold temperatures can affect the phone's battery, screen, and other electronic components. Lithium-ion batteries, commonly used in smartphones, can be sensitive to temperature fluctuations and might lose capacity or even become permanently damaged if exposed to freezing temperatures for too long.
Cracking or Brittle Components: Some materials used in electronic devices can become more brittle in cold temperatures, potentially leading to cracking or damage when the phone is handled.
Loss of Data: If you had any data stored on the phone's internal memory or external storage (such as an SD card) and didn't back it up before placing the phone in the freezer, the cold temperature could exacerbate any existing damage and make data recovery more difficult.
In summary, putting a phone (dead or alive) in a freezer is not recommended, as it can lead to potential damage and make the phone non-functional. If you need to dispose of an old phone, it's better to follow proper electronic waste disposal procedures or recycle it responsibly. If you need to recover data from a non-functional phone, it's best to seek the assistance of professional data recovery services.