There is no "in" key on cell phones. You may have misheard and are looking for the "end" key, which is the hang-up key which usually either has the word end written on it in red, or a picture of a...
Deactivating keypad tones..
Go into settings,then weither phone settings, or more likely, tone settings, scroll through until you find "key tones" or "keypad tones" and turn it off.
<p><p>The first cell phones were developed in 1973 by Martin Cooper of Motorola, he did have assistance in the development and invention. The initial device was large and expensive, the...