Short
Message Service (SMS)
SMS is the service through which text
travels from one phone to another. Messages are limited to 160 characters
including spaces, hence the name "short messaging service." Depending
on your cell phone provider, your phone will either prevent you from typing
past 160 characters, or it will send your message in blocks of 160 characters.
The
Control Channel
Once your message is typed, it travels
through radio waves to the control channel. The control channel is the pathway
that allows your phone to communicate with your cell phone tower so that your
phone can send and receive calls, data packets and SMS messages.
The
Short Message Service Center
The short message service center (SMSC) is
the section of your wireless service that stores, forwards and receives SMS
messages. Once a text message travels through the control channel, it arrives
at the SMSC to be stored or sent immediately if the recipient's cell phone is
active and enabled to receive text messages. If the recipient's cell phone is
inactive or otherwise unable to receive text messages, then the SMSC stores the
message until it can be sent.
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