For those that want to get free cell phones for senior citizens, they need to apply through a cell phone provider that has this program. Each state varies with their program so you should check your state and find out what exactly do they offer. There are also several different providers that have this program. Most likely you would have to send some information regarding your income and assets. The closer your income is to the poverty line, the more likely you will be able to get free cell phones for disabled people.
I call my grandparents once every week and I make sure that they are ok. They usually have enough minutes to use each month so they never run out. I guess they do not use the phone that much. If it were me, I would certainly have used up all the minutes. That is one thing that you have to watch out for. Make sure you do not run out of minutes before the month is up. I would recommend checking the amount of minutes every few days to make sure you are on track by the end of the month.