911 outages in Plano, Garland, Rowlett, Wylie being investigated

- Several cities in Collin and Dallas County are investigating the source of a 911 service outage that lasted several hours on Sunday and Monday.

In Plano and Garland, T-Mobile wireless customers could not connect to 911. In Rowlett and Wylie, the disruption was more widespread.

The problem was related to service lines provided by Frontier Communications.

It started late Sunday when Rowlett’s 911 calls started rolling over to Garland. The call would then confusingly connect back to Rowlett. Then later the system started receiving ghost calls with no data. Dispatchers did as they were trained and hung up and called the person right back.

“Very serious and very frustrating,” said Alberto Irizarry, Garland Police. “Public safety is our number one priority.”

Both Garland and Rowlett's police spokesmen said they couldn’t remember a technical problem preventing calls from going through.

Police and Frontier said they have no reason to think the technical problem that led to the issues had anything to do with anything malicious.

Click here to find a listing of direct lines to the 911 call centers in each of the four affected cities.

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