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The transportable Bag Kit can be a solution.  Standard components of this system are a 120V AC power adapter and a 12V DC power adapter.  Moving this cellular signal amplifier from vehicle to home or office is only a matter of unplugging it from its power source and retrieving the external antenna.  In fact, you can leave the 4" magnetic mount antenna with your vehicle and install a more permanent external antenna on the roof of your home.  Just plug in the antenna cable before applying power.
 
The Bag Kit is a "direct connect" amplifier...meaning that there is a cable that will connect to your cellular handset as well as the amplifier.  This will give you approximately 8 to 10 feet of movement away from the amplifier unit.

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The DA4000MR-10A is a "repeater" system that will rebroadcast the cellular signal throughout your vehicle (up to 1,000 sq. ft.).  The amplifier is very similar to that of the "Bag Kit", however there is no physical connection to the handset.  This allows freedom of movement and multiple users.
 
This equipment will function with virtually all cell phone networks (except the iDEN network) and will operate with different carriers at the same time.  This dual-band system is easily installed into your vehicle and powered by the standard 12V DC adapter or the optional 120V AC power plug.