Prefix overview
Phone numbers in prefix 307-243
This page covers the 307-243 prefix in the United States. It shows where numbers come from, which carrier is linked to the range, and how this block is structured.
If you are looking for a specific number, you can continue to its dedicated phone page. Otherwise, this page helps you understand the broader number block behind it.
PREFIX
307-243
RATE CENTER
CASPER
CARRIER
ONVOY, LLC - WY
WY
Prefix range
The prefix 307-243 includes numbers from 3072430000 to 3072439999.
This range is associated with the CASPER rate center and was originally assigned to ONVOY, LLC - WY.
Numbers in this prefix
20 numbers