No, you should not microwave water with a cell phone, and it's not safe to do so. Microwaving a cell phone can cause damage to the phone, and it may even pose a fire hazard due to the electrical components and batteries inside the device. It's essential to keep any electronic devices, including cell phones, away from microwave ovens.
As for microwaving a cup of water, it is generally safe to do so, and many people use microwaves to heat water for various purposes like making tea, coffee, or instant soups. However, there are a few precautions to keep in mind:
Use microwave-safe containers: Ensure you use a microwave-safe cup or container to heat the water. Most ceramic, glass, and microwave-safe plastic containers are suitable for this purpose.
Avoid using metal: Do not use cups or containers with metallic elements or metal handles in the microwave, as metal can cause sparks and potentially damage the microwave.
Prevent overheating: Be cautious not to overheat the water, especially if it's plain water without anything else in it. Superheating can occur, where the water's temperature goes beyond its boiling point without actually boiling, and then it can erupt violently when disturbed. To avoid this, you can place a non-metallic item like a wooden stir stick in the cup while microwaving to help prevent superheating.
Handle with care: When removing the cup of water from the microwave, use oven mitts or a towel, as the container may become hot.
As long as you follow these guidelines and use a microwave-safe container, microwaving water should not damage the cup or pose any significant safety risks.