Enhanced 911 Phase I service is the first step in providing better emergency response service to wireless 911 callers. Public Safety/911 Communications Centers need to send a letter to T-Mobile requesting Phase I service deployment at their agency. Once Phase I service has been implemented, when a wireless 911 call comes into the 911 Communications Center (also called a Public Safety Answering Point or PSAP), the call-taker's computer screen will show the wireless phone's 10-digit call-back number if one has been assigned to the calling handset. In the event the wireless phone call is dropped, the call-taker may contact the caller. Phase I service also identifies the cell site/sector location information that the call was originated on to the call-taker's computer screen. This provides the call-taker with a general location (i.e. within the site coverage area) of the caller. The handset must have battery power and be in a coverage area to complete a 911 call.
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