TEL? is the abbreviation of the word Telephone, which is the telephone number.

The most common one is the R in the upper right corner, which means a registered trademark.

[Examples and usage]:

I have to make a telephone call.?I have to make a telephone call.

I telephoned to thank her/his. I called to thank her/him.

You can always reach (ie contact) me by telephone.

Telephone classification:

1. Wired telephone:

Telephones convert the sound waves from the terminal into electronic signals and transmit them to long distances through telephone lines. It has the function of regenerating the electronic signal sent by the other party into voice (sound wave) at the same time, allowing the caller to communicate with the other party, and sending a signal (dial pulse) that can be selected from multiple other parties to inform the other party of the call tone.

2. Wireless phones:

Wireless phones include analog cordless phones, digital cordless phones, mobile phones, PHS, etc.

3. Smart phones:

In addition to complete fixed-line phone functions, smart phones usually also have large-capacity business card management functions, incoming and outgoing call management functions, and prevention of phone harassment ( Telephone firewall) function, enterprise group phone business card (internal business card) management function, and many auxiliary office functions.