It's technically possible, but involves forsaking: personal mobility, the ability to start a family, private healthcare, taking leisure holidays, costs of seasonal cultural/religious events, the ability to buy a home and any safety net for disasters, emergencies or unforseen events. It also excludes inflation, which is likely to outpace any pay rises or promotions.

Even if self-imposed, I'm not sure choosing to live a life which excludes things listed on the Universal Declaration of Human Rights should really count. This is why the idea of a "living wage" was created, to show the cost of entry to participate in society as it is - more than simply having a phone contract. https://www.livingwage.org.uk/sites/default/files/LWF%20Life...