Menu >> Settings >> More Networks or locate Wireless and networks >> Mobile Networks >> 
Access Point Names >> Press the Menu Button and Select New APN >> Edit the settings 
by Entering TIGO as Profile Name / INTERNET or WEB.TIGO.COM.GH as APN / 
kindly ignore the Proxy and the Port / Press the Menu Button again and save the settings/
ensure the data is active/ your phone has been configured and you can browse the internet.