Simple technology for ederly

I’m also struggling with the phone problem. We recently moved mom to a nursing home, but her cell phone doesn’t get a good signal. We can call her on her landline phone, but she can’t call out. She really likes having the freedom to make calls, but she has days when she really struggles using her phone and other days when she is fine. She currently has a jethro phone that only runs through t-mobile so I can’t just switch to a different carrier that has a better signal. It’s pretty basic and the plan is only $100 a year (no text, not internet). She has had the phone for about 2 years, so it’s possible it just needs to be replaced, but if I replace it and she still doesn’t get a good signal. I’ve looked at the raz phone. It seems pretty easy to use, but it’s not cheep and I couldn’t find an inexpensive plan either. I have also considered the jitterbug. This is less expensive, but doesn’t offer some of the remote extras the raz phone does. Even if the phone is simple to use it’s going to be different for mom and I’m not sure if she will be able to figure it out. There is no point in putting hundreds into a phone she can’t use. I know when I bring her the new phone she is going to be mad. She has told me many times how much she hates her current phone that I pick out for her. It’s alway the phones flat and in turn mine for picking out the phone. She demands to be involved in the next purchase. I guess that’s just part of the dementia and anosognosia, caregiver takes all the blame. Any ideas on phones would be appreciated.