byte
Definition:
A way to measure how much information can be stored on a device. One byte is enough space to store one letter of a word. For instance, five bytes would be need to store the word "hello".
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text message
A text message is a short (160 characters or less) message sent between two mobile phones. Text messaging is available on most digital mobile phones but depending on your calling plan you may incur additional per message charges to send and receive text messages.