Prefix overview
Phone numbers in prefix 331-850
This page covers the 331-850 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
331-850
RATE CENTER
BIG ROCK
CARRIER
ONVOY, LLC
IL
Prefix range
The prefix 331-850 includes numbers from 3318500000 to 3318509999.
This range is associated with the BIG ROCK rate center and was originally assigned to ONVOY, LLC.
Numbers in this prefix
20 numbers