Who uses a pay phone?

So just recently seeing a pay phone at a major university one of my family members just graduated from made me think... Who still uses these things? I would of thought that cellphones and the huge amount of them all around that you could ask to use if you didn't have yours would well, put these thing out. Just doesn't make sense, it's funny. I guess someone somewhere will be able to sleep at night knowing that if they might possible need one, it's there available. "Please dust of phone before and after use."