Not really getting calls?

In some parts of the U.S., Backpage is quite effective.

For example, in my area (Tucson, AZ), most of the escorts use it. Many of the established, reputable escorts use it regularly. They also use many other advertising means -- there are over two dozen different sites where escorts advertise on the internet.

Just like in any business, a (prospective) new entry into the field should do a market analysis. Find all places in your area where sex workers advertise, and note which ones are used the most. This can also help you find your own niche in the sex work industry in your area.

Here are some sites to get you started:

SexyEscortAds (this site)
Eros
TER
SEXCIA
CityVibe
FindaLay
Backpage
and many more...