i-DEN

Integrated Digital Enhanced Network, commonly referred to as iDEN, is a mobile communications technology, developed by Motorola, which provides its users the benefits of a trunked radio and a cellular telephone. Sprint Nextel is the largest US retailer of iDEN services. iDEN places more users in a given spectral space, compared to analog cellular systems, by using time division multiple access (TDMA). Up to six communication channels share a 25 kHz space; some competing technologies place only one channel in 12.5 kHz.
iDEN is available in other countries through several carriers including Nextel International. Nextel International allows direct connect (PTT operation) between users in several countries including the United States, Argentina,Brazil, Chile, Mexico, Peru, and Canada.