The IS-136 reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

IS-136

IS-136 is a digital extention to the Advanced mobile phone system (AMPS). It was designed to use existing AMPS channels. IS-136 superceded IS-54, a previous extention to AMPS, adding features such as text messeging and data capabilites. It divided each AMPS channel into seperate subchannels using TDMA technology.

IS-136 is used primarily by Cingular Wireless and AT&T Wireless, although both companies are now migrating to GSM technology.

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