Need phone advice for aging parent

Thanks for the ideas! Mom is not capable of using a cell phone. We tried several previously. We will check with her phone co. since she has a land line to see about text. My sister just bought an ATT phone that has 5 boosters, but Mom needs to push the booster with each call. She doesn’t remember to push it. I will tape a note to the phone as a reminder. Thanks again for the suggestions. We will work our way through the options ...