I want to drop my landline service and rely on cell phone only...but...!

Many people do this already and manage by just keeping their cell phones with them wherever they are in their living space. Others (like me) who don't like to carry a cell phone around at all times and who live in spaces with multiple rooms or floors know that cell phone service is often unavailable depending on physically where you are at the moment. So I want a solution something like this: 1. A cell phone charging cradle that connects to cordless (meaning wireless) phones that just plug into an electricity socket for power. These phones will most likely be left over from a previous land line setup. 2. The cradle can be located in my space where cell reception is best. 3. The cordless phones can be located in convenient locations throughout. One cordless phone is connected to the cellphone cradle by 4 pair telephone cable with RJ-45 jacks so it must be nearby the cradle...not the best. (Or alternatively and better...requiring at least one new cordless phone with bluetooth... the first cordless phone would be located within bluetooth range of the cell phone cradle and then communicate with the other cordless phones utilizing the normal cordless frequency band.) 4. When a call comes in on the cell phone...all phones ring (or not depending on a mute switch on the cordless phone) 5. Calls can be originated from the cordless phone but travel on the cell phone selected network. 6. All cell phone features such as call waiting etc would be available on the cordless phones. XLink has a partial but expensive (to me) solution. I am relying on the review. I have not actually tried XLink. It uses bluetooth to connect the cell and cordlesss.) http://www.osnews.com/story/19593/Review:_Mobile_ Phone_Signal_Amplifier_and_Bluetooth_Gateway/ Heres the XLink web ref: http://www.xlinkgateway.com/bt.html This device is for someone who wishes to eliminate a landline entirely. XLink has a similar device for someone who wishes to retain a landline. 7. Last I would like the bluetooth channel to connect to any WIFI within range. (This is a function listed in the original specifications of a 'perfect cellphone' that chooses any WIFI for the communications channel if it make sense..of course this requires a VOIP function but then this is a blog about the 'perfect' hand held digital device.) I would want a software function on the cellphone, based on parameters I provide, to use WIFI as the communications channel rather than the cellular network, if a call characteristic matches a criteria ...for example if a call is out of the boundaries (to another country) of my unlimited cellular plan. Here's an About.com FAQ on the issues involved in settling on the use of a cell phone only. Here's a recent update about the choices being made to eliminate landlines and manage only with cell phones