Why do mobile phone text messages always resend?

This is caused by poor cell phone signal.

Cell phone signal-Cell phone signal The electromagnetic radiation released at the moment of cell phone contact is the largest. Therefore, it is best to answer the phone after the phone rings for a second or two or after the phone rings twice.

Signals (also known as signals) are tools and carriers of information. Broadly speaking, it includes optical signals, acoustic signals and electrical signals.

For example, the ancients used the billowing wolf smoke generated by lighting beacon towers to convey the news of enemy invasion to distant troops, which is an optical signal.

When we speak, sound waves reach other people's ears to make them understand our intentions, which belongs to acoustic signals; All kinds of radio waves propagating in space and currents extending in all directions in the telephone network can be used to express all kinds of messages to the distance, which belong to electrical signals.

Only by receiving light, sound and electrical signals can people know what the other party wants to express.