According to an article by WSOC-TV in Charlotte, NC, emergency medical service agencies are being faced with a new challenge as more people stop using landlines and solely depend on cellphones.

Cell phones and other devices, such as calls over the Internet (or Voice over IP), can make it difficult for dispatchers to pinpoint the precise location of emergencies, according to the report.

Calls from cellphones connect to the nearest cellphone tower and it takes time for 911 operators to trace that call to where the signal originated from.