If you live in town, you can get landline service. We cannot get it where I live in Orchid Bay because we are located outside of town. So we use cellular.
It is not very expensive to get landline service. It only costs about $50 Belize (US $25) a month but most people just rely on their cellphones. There are many more cellphones than landlines here in Belize.
(Rainbow over Orchid Bay, Belize, pictured.)