Using mobile phone

Using mobile phone on public space is often seen as a bad manner, but the wilder they are spreaded, the softer the recognision to them is. In my opinion, mailing on public spaces is acceptable, because it will not annoy people around you. Though some people may think do using it is annoying for them, but cosidering the importance of the mobile phone, they should reconsider them, I think. Such a prejudice are often appeared in older person, I think.