Even though I have registered and blocked my incoming calls, they still come. The only way to avoid these calls is to get a private line and pay a monthly fee to the phone company. This is by design as it leads to more monthly income for the phone companies to compensate them for the loss of robo call revenues.
With a cell phone and a list of suspected phone numbers, it is possible to do an online search through duckduckgo.com as there are hundreds of new online companies that feature reverse phone subscription services to root out the robo calls. However, many of these online subscription services could also be a scam.
I have several friends in Arizona who have worked in various industries. Away from the residential areas, there are rows and rows of warehouses where people work in assembly lines, in repair shops, or in fulfillment centers where employees handle online orders or phone orders These warehouses do not have air conditioning so the employees must work during the cool hours from about 8 PM until as late as 2 PM. During the day, the temperatures during the spring, summer, and fall can reach 120 degrees.
Also In the Phoenix area, there are rows and rows of warehouses where people work from 5 AM to 8 PM. These are the robo call centers. They have rows of desks in a huge warehouse campus with very little air conditioning, the minimum allowed by law, so that the employees sweat in these warehouses. Yet, these employees , men and women, are expected to wear dress shirts and slacks or skirts.
In these robo call centers or call banks, the employees are surrounded with phones, which constantly light up the moment a person hangs up. Computerized phone banks dial preselected phone numbers that are sold to these robo call centers from businesses who have done business with these customers. Thus anytime a customer gives his phone number to a business, that business could resell that phone number to another business.
The people employed by these centers are given minimum wages with bonuses for the first three months, which includes about three weeks of training. After training or even during training, they can be fired. After training, if they do not answer the call as soon as it rings, or if the person on the receiving end hangs up quickly, then they are charged for a dropped call or for a hang up call, but they are not told this during training. In addition, if they are talking to a minor or a senior citizen, the contracts and warranties do not apply., so they are also charged for that missed opportunity. In the end, these employees rarely make enough to support a family, and must depend on food stamps.
If the employee succeeds in obtaining a certain number of contracts, they are rewarded with flags and/or balloons of recognition.
These companies are not unionized, so breaks are not given. They are not paid for lunch time or for overtime, but they are allowed to have coffee or food at their desks while they work. If they miss work due to illness or if they take too many toilet breaks, they are fired. From what I was told, there is no health insurance, no dental insurance, etc.
These robo call centers sell everything from home insurance, car insurance, home warranty protection plans, home security plans, appliance warranties for washing machines, dryers, refrigerators, and computers, etc.
ATT, Verizon, Frontier, etc., are all involved in these phone scams. They are the ones fronting the money for these robo calls centers. Therefore, after the contracts are sold, the employees at the robo centers do not get any renewal bonuses for all their hard work. Those renewal revenues go to the phone companies. This means that the employees must generate new contracts in order to stay on the job. Those who generate the most new contracts per month get bonuses. Later on, they will be given raises and be promoted to teach the new employees. Few employees make that pay increase as most employees are fired with new trainees being hired each week to take their places. Folks, this is nothing more than a grand pyramid scheme.
The local Department of Water and Power sells lists of phone numbers to solar energy contractors, home repair contractors, and building contractors. These are the most egregious of the robo calls I get. They are aggressive.