The story
2006
At the end of 2006, Amp'd Mobile had over 100,000 subscribers. 89 percent of its customer base was on postpaid contracts, and its total average revenue per user was “well over” $100 per month.
2007
Amp'd Mobile filed for Chapter 11 bankruptcy protection on June 1, 2007. Its subscriber base at the end of the first quarter was about 175,000 customers.
On July 20, Amp'd announced its intentions to sell off all its assets at auction. In addition, Best Buy discontinued carrying the Amp'd post-paid service.
On July 21, 2007, text messages began to be sent to Amp'd Mobile customer phones that stated: Your service may be disconnected on 7.24 @ 12:01 am. Go to www.ampd.com or contact the location where you activated your service for further information.
On July 24, 2007, Amp'd website updated its FAQ with potential service disconnection pushed back to July 31, 2007.
On July 31, 2007, Amp'd sent a text message: Ampd service ends @midnight 8/1. Keep your Ampd phone and get 100 free TXT by switching to Prexar Mobile. For info, go to http://www.prexarmobile.com As of June 2008, the Prexar Mobile website and brand are defunct.
From Wikipedia’s article on Amp'd Mobile, shared under CC BY-SA 4.0.4