Where can you find cellular phone services for senior citizens?

There are some cellphone companies, such as Jitterbug, that specialize in easy-to-use phones for senior citizens. But, since this is one of the fastest growing populations of cell phone users more and more cell phone companies are coming out with suitable phones designed for seniors. It may be more cost effective, if you are looking for a cellphone for a parent or other family member to check with your own cell phone company first for a phone that you can add to your own plan at little to no cost.