I think it's pretty necessary. I remember I went to a theme park and wanted to have a good time and got drenched. My new phone was ruined. Just the other day, a

I think it's pretty necessary. I remember I went to a theme park and wanted to have a good time and got drenched. My new phone was ruined. Just the other day, a friend that tried to throw me into a pool got pulled in with me. He had his phone on him. Though the last one is a bad example, sometimes you want to do something spur of the moment and not worry about ruining your phone.