I have my home office in the basement and trust me on this but the AT&T coverage in the basement of my house is really one of the worst in the whole area.Certain times I have to forward the number to a land line to get those calls and it makes the procedure a bit longer which is an difficult thing to be everyday continuously. The only thing I want is instead of forwarding the number to a land line, do I have another option like cell carriers supporting VoIP to use either the cell phone or any other Wi-Fi phone for making calls based on my cell phone number?