Why is it necessary to reboot a phone after making updates or changes?

Rebooting a phone is essential after updates or changes to ensure that the modifications take effect. For instance, if a user's name is updated on extension 116, the changes won't be reflected on others' phones until a reboot is performed. Additionally, scheduling reboots is vital for implementing widespread changes, such as updating the transport method from UDP to TLS, ensuring a synchronized update during after-hours.