Off-peak - Times when a carrier offers discounted airtime rates or free minutes, usually weekends and after normal business hours.
Operating System - The base software that controls the operation of a mobile device and runs other applications. Windows Mobile, Google Android, BlackBerry, and Palm are examples of operating systems.
Pay-as-you-go - Wireless service that is prepaid with no contracts or ongoing usage bills.
PC Card - A device about the size of a thick credit card. Devices enabling wireless internet access are often PC Cards.
PC Sync - The process of connecting a mobile device to a computer to sync data including but not limited to calendars, contacts, applications and music.
Peak - Times when wireless network usage is heaviest and full usage rates usually apply. Usually close to standard business hours.
Picture ID - The picture associated with a specific contact. Will usually be displayed while in-call with the contact.
Picture Messaging (EMS) - The ability to send or receive short messages from a mobile device that include images, video and/or audio.
Personal Identification Number (PIN) - A numerical code, usually composed of 4 digits, that acts as security code to gain access to accounts or services such as voicemail.
Polyphonic Ringtone - A ringtone in which more than one musical note is played simultaneously. Used to indicate an incoming call or other event such as a new text message.
Predictive Text Entry - A feature that allows for the entry of text by pressing only one numerical key that is associated with multiple letters. A device equipped with predictive text entry will automatically determine the word a user is typing based on possible letter combinations.
Prepaid - See 'Pay-as-you-go.'
Push-to-talk - A verbal communication service that works like a "walkie talkie," allowing a user to radio another user or group of users when holding down a transmit button.
QWERTY - Refers to the contemporary layout of full-size keyboards.
Refurbished - Refers to a mobile device that was previously used (or at minimum removed from its factory-sealed box) that is inspected, tested and restored by the factory or an authorized service center to be fully functional.
Resolution - Refers to the number of pixels in a device's display. The better the resolution, the higher quality the image.
Ringer ID - A ringtone that is assigned to a specific individual or group, and will only sound when the individual or a member of the predetermined group is calling.
Ringtone - A sound used to indicate an incoming call or other event such as a new text message .
Roaming - Refers to using a mobile device outside its home calling area. A most modern wireless plans include nationwide roaming, domestic roaming charges are, for the most part, a thing of the past.
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