Cellnet is working on a system where one number will automatically transfer between home and mobile phones. The company is working on technology that switches calls made to a home number over to the owner’s mobile as soon as the person exits the house. On their return, calls automatically revert back to the household phone. Cellnet’s "One-phone" targets people running businesses from home. The device should be available in the next few months, and is estimated at around £500, according to today’s Daily Mail. Calls made at home will cost the standard rate, switching to the higher cellular charges outside the house. The system will have two handsets, a cordless digital phone inside and normal mobile outside. The technology will be stored in the home phone’s base. Dirk Bout, senior Dataquest analyst, said the concept of sharing one number was certainly nothing new, but added: "With the automatic switching, this would appear to be the first phone system of its kind." When the person moves out of the range of the cordless base’s digital radio waves, the conventional Cellnet network takes over. This means the home phone will not ring, forcing anyone remaining in the house to buy either a separate land-line or their own One-phone. As Cellnet pointed out: "There really is no excuse to miss an important call again." Yes, but what about those calls you want to avoid? ®