Also there are is a discount that is Federal on telephone service for those who are low income. Since many on disability are also low income, if you think you might qualify I have put link below. You can only receive the Life Line Credit on one phone line. Even if you have a landline and a cell, you can only receive it on one line. You do have to reapply every year and provide proof of income.
Lifeline: Affordable Telephone Service for Income-Eligible Subscribers-
www.fcc.gov/guides/lifeline-and-link-affordable-telephone-service-income-eligible-consumers