Are you asking about a ISP or local WiFi connections/hotspots. They are not the same. A Internet Service Provider (ISP) is what you need by the sounds of it. If you want a wireless connection within your house then just buy a modem that offers you WiFi. It is up to you how you connect your devices to your modem (cable or Wifi).
WebAfrica is a great ISP if that's what you are looking for.