Should cellphones be banned at school?

In the 20th century the cellphone problem didn't exist but nowadays it is an obvious problem that needs to be dealt with. The first reaction of schools was banning cellphones but nowadays the problem persist and they're wondering if they should ban the cellphones or they shouldn't. In the first case, banning cellphones is just a short-term solution because they still can buy or get another one, and they're not learning the appropriate uses of a cellphone. This kind of arguments are making schools change their cellphones policies. Nowadays some schools allow the use of cellphones with one condition, if it not distracts the other students. This is a big step in this matters, and it means that schools are adapting to technology. With the abundance of iphones, ipads, androids, galaxy tablets and laptops, schools and teachers just saw either a big powerful tool for learning or a massive distraction for students. This is why I think that now they shouldn't ban technology; they should teach students the appropriate use of it because cellphones (and other electronic devices) are going to be used during the student's whole life, and if they want to be prepared they need to know the appropriate use of them.