the.avon.lady1 ~ If you're like me, you will use it more than you ever thought possible. It will be your all-in one. Camera, recorder, calculator, GPS, timing device, flashlight, magnifying glass. You will be able to access your scheduled shops/guidelines, your email, documents, news, bank accounts . . .
Are there "enough to help justify having the phone"? That all depends on where you live and what shops are available that you want to complete. Love it, when I am out and about, and I get texts from MSCs offering well-paying shops close to where I am. Depending on your tax situation, there may be additional advantages. But, that's me.
Having a smartphone is worth serious consideration.