How about a cordless phone?
Yes. Cordless telephones are as fixed as regular telephones. Just the receiver doesn't have a line. Then you can pick up the receiver and answer the call in a certain range. That's the concept of a cordless phone
Do not need to open your home. The premise is that telecom Telecom number. The cordless phone itself is not the number. Its basic principle is the same with ordinary telephone. Just some more advanced, as long as you put the original plug on the common telephone line is inserted into the cordless phone on the line.
