Her line cost only $9.99 (she paid $15/month) before. She pays $25/month now.
T-Mobile has a good deal. $100 versus $160. I'll look into it more, but, I don't foresee switching. They can make claims about their coverage but it doesn't seem to jive with the experiences of others.
I have not fully verified their current coverage claims, and did notice some difference in coverage several years ago.