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Phase II Wireless E911 Technology Choices
As of May 2003, here are the methods being used by the largest wireless carriers to provide Phase II service:
| Carrier | Network Technology |
Phase II Technology | Type |
| T-Mobile | GSM | network | |
| Nextel | iDEN | A-GPS | handset |
| Cingular | TDMA-GSM | network | |
| AT&T Wireless | TDMA-GSM | network | |
| Verizon | CDMA | A-GPS/AFLT | handset |
| Sprint | CDMA | A-GPS/AFLT | handset |
Both Cingular and AT&T Wireless are phasing out their TDMA networks.
* In Oct. 2002 Cingular and AT&T Wireless notified the FCC that it was halting E-OTD development because they were uncertaint that
the technique could meet the accuracy requirement by the Commission's deadline. In March 2003 T-Mobile also told the FCC
it would stop deployment of E-OTD gear. The carriers said they would test U-TDOA technology to provide Phase II service.