کتاب 'فیس تو فیس' فوق متوسط - واحد 7 - 7D

an official agreement between two or more sides that states what each of them has to do

a payment system in which one is only able to use a service up to the amount that they have paid for, and payment must be made in advance of using the service

to use the available supply of something, leaving too little or none

the ability to obtain goods, services, or funds based on trust, allowing payment to be deferred

a system of intersecting lines or channels that form a web-like structure

to end a phone call while the other person is still on the line

the quality or the act of receiving radio, television or cellphone signals

a sound or melody that plays on a mobile phone to alert the owner of an incoming call

a system that allows callers to leave recorded messages for someone who is unable to answer their phone

a machine that can automatically answer calls or record messages left by others when connected to one's telephone

a telephone in a public place that one needs to pay for, mostly by prepaid cards

a portable device that combines the functions of a cell phone and a computer, such as browsing the Internet, using apps, making calls, etc.

(computing) relating to a technology that helps one type more quickly by finishing their words based on a few first letters

a specific function or capability of a device or software

a display by which the user can interact with a computer, smartphone, etc. by touching its surface