Looking Mobile Phone in Dar (short-term) (Dar es Salaam)

Hi there, just landed in wonderful Dar (and thanks to this site I believe I found the perfect place to stay for the next five months!). So here's the next challenge... I'd like to use a basic phone, no smart, no internet, no thrills, just to place/receive local calls. Any ideas/suggestions? Perhaps someone wants to get rid of an old phone in exchange for a dinner invitation? What company/plan would you recommend for minimal phone use, locally only? Cheers, Joshua