Quote:
Originally Posted by fiedlerh
Some of our elderly relatives have trouble hearing the poorer quality of cell phone calls.
In our area when the power goes out, the cell phones go out too. Land line goes out when it rains a lot. If it rains a lot and the power goes out, we have no phones at all. 
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Try installing an old fashioned handset along with the cordless phones. The telephone company is still required to provide proprietary power on the line (-48VDC) so you can receive and break dialtone to make a call. The central offices have huge battery banks for back up power should they lose power.