My employer wants me to get a list of cell phone prefixes by area code. I think the owner wants to find out how many of our callers are calling from a cell phone, and if a cell phone, what carrier they are using.
I've spoken to our voice/data provider and they basically said they can't help and to use google. I tried google, but I'm not finding much. I've searched on other sites specifically for telecommunications, such as Local calling guide: Main but I'm unable to find this specific information.
Does anyone here know of any resource where I can get a list of phone number prefixes by area code that are assigned to cell phones only?