I am happy to have simplified my life in Nicaragua and downgraded to a very basic phone. I use a prepaid Claro cell phone that cost some US $20 - $25 for the device itself. While I don't use the phone often, I add maybe $5 / week (adding credit is simple - it can be done at many ATMs, shops, street side stands, grocery stores, etc). Better yet, every couple days you will be notified by Claro that by recharging on certain days your credit will be tripled, quadrupled or even quintupled.
I often use my phone to call back to the States at just $0.15 / minute, I'm not sure what local calls cost, but even less it seems. I don't use data, but I understand there are some very reasonable plans with unlimited data / calls / messages. Certainly more reasonable than the $120 / month I was paying in the States. Hope this helps!