engaged
[adjective]
involved in a task, project, or other activity, either mentally and emotionally or physically
to go off
[verb]
(of alarms) to start making a lot of noise as a warning or signal
phone network
[noun]
a telecommunication network allowing calls and messages to be sent and received between phones
pay as you go
[phrase]
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
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