Best Cell phone for a low tech low use Senior?? | Phone/Device Issues and Features | Consumer forum

I am wondering if the forum readers have any phone suggestions for me. I am looking for a cell phone for someone who only wants a phone for emergency calls. It has to be very easy to use and ideally the biggest number keys. It seems to me the speakout plan would be best, but which of the phones? The 1661 keys are very small. Is there another option which i can buy outside of Speakout but still use the speakout plan? thankyou