There are still some advantages to carrying a CB radio for emergencies. Think about the last time you were in a very rural area and couldn't get cell phone reception. Now, imagine being in that area with no reception and no cell service.
Yeah. Uh oh.
In that case, a CB radio that doesn't rely on a cell tower could be a life saver. Cell phones are very common, but there is still a problem with them out in more remote areas where no one has bothered to build a cell tower because few people would take advantage of it.