Spectrum: The entire range of electromagnetic frequencies

Standby time: The amount of time one can leave a fully charged cellular phone turned on before the phone will completely discharge the batteries. See talk time.

Subscriber: A user of wireless service bought from a service provider.

T9® Text Input: A feature built into some cellphones that allows you to use one key press per letter when entering text (SMS/Text Messaging) on your wireless phone.

Talk time: The length of time one can talk on a cellular phone without recharging the battery. The battery capacity of a cellular portable or transportable is usually expressed in terms of so many minutes of talk time OR so many hours of standby time.

TDMA (time division multiple access): A method of digital wireless communications transmission allowing a large number of users to access (in sequence) a single radio frequency channel without interference by allocating unique time slots to each user within each channel.